Headphones & Headphone Accessories:
A+:
Audeze LCD-5: $4500
The open-back LCD-5 is the successor to Audeze's well-regarded LCD-4 and, like its predecessor, uses planar-magnetic drive units, which feature proprietary, single-sided Fluxor neodymium N50 magnet arrays and a voice-coil concept called Parallel Uniforce. The idea is to vary the width of the conductor to match, or counter, variations in the magnetic flux to achieve uniform force across the membrane. The 90mm diaphragm is just 0.5 microns thick. JMu wrote that whatever source/amplifier setup she used, aspects of the LCD-5's signature sound seemed consistent: air, spaciousness, and openness combined with copious fine detail. "Live recordings sounded live; well-made studio recordings sounded alive, with sufficient energy and detail to seem real," she commented. (Vol.46 No.12 WWW) Dan Clark Audio Stealth: $3999.99
The Stealth weighs 415gm and presents a low (23 ohm) impedance and a low (86–87dB/mW) sensitivity. HR was impressed by these closed-back, planar-magnetic headphones, which feature a patent-pending Acoustic Metamaterial Tuning System (AMTS)—an intricately formed, waferlike partition situated between the driver diaphragm—and the deeper-than-average ear cavity. He wrote that the Stealth's sound was "clear, finely detailed, and extremely well-balanced" though he also noted that it was also "somewhat distant," lacking some high-frequency directness compared with the HiFiMan Susvara open-back planar-magnetics. However, he found that the Stealth's upper bass and lower midrange were tauter, fuller, and more vividly portrayed than the Susvara's, a balance that worked well with female vocals. He concluded that the Stealth's most prominent virtues were its comfortable fit, its extraordinary build quality, its elegant way with detail, and its marvelously balanced, low-fatigue presentation. (Vol.45 No.7 WWW) dCS Bartók APEX Upsampling DAC/Network Streamer: $22,950 incl. headphone amp
See "Digital Processors." dCS Lina Headphone Amplifier: $9750
This British, solid state, class-AB headphone amplifier is specified as outputting 2W into 30 ohms and 0.48W into 300 ohms with balanced 'phones, or 1.6W into 30 ohms and 0.2W into 300 ohms with unbalanced. There are three pairs of stereo analog inputs: one unbalanced; one balanced and buffered (high-impedance); and one "unbuffered" balanced for use with low-impedance source components. There are three headphone outputs: two 3-pin XLR—one each for right and left channels—one 4-pin XLR; and one ¼" jack. With HiFiMan's HE R10P, HR found the sound was "sharp, lucid, and emotionally affecting." With JPS Labs' Abyss AB-1266, he noted that the presentation was a touch dry compared to the tubed Feliks Envy and LTA Z10e amplifiers "but well-formed, brisk, and super-transparent, with assertive beat-keeping and state-of-the-art vocal intelligibility." Compared with the Feliks Envy, the Lina's overt transparency made the Envy seem hazy. Overall, "the Lina presented performers' images with a sculpted mass that contrasted with the Envy's gentler, more holographic presentation." (Vol.47 No.3 WWW)
Feliks Envy: $7995; Performance Edition costs $8795
This moderate-sized, single-ended headphone amp from Poland uses Psvane CV-181 (6SN7) twin-triode driver tubes and either Electro-Harmonix Gold 300B output tubes (standard version) or TJ Full Music 300B output tubes (Performance Edition). Specified output power is 8Wpc. There are three analog inputs, one balanced using transformers and two unbalanced (RCA). In addition to balanced and single-ended preamp-level outputs, there are two headphone jacks, one of them balanced. The gain can be set to three different levels, and HR found that at the Envy's highest gain setting with the TJ Full Music 300Bs, "it made the famously hard-to-drive HiFiMan Susvaras light up and sing, with great purity and feeling." With ZMF's sensitive Verité closed-back headphones, HR used the Envy's middle gain setting and noted that "beauty and boogie combined forces to make focused listening easy." He also used the Electro-Harmonix 300Bs and concluded that some users might prefer the E-H's "earthbound realism over the slightly fuller, marginally more fantastic-sounding Full Music 300Bs." Overall, with every headphones he tried, the Envy "performed as though it had been engineered to present recordings in the most vivid manner possible, be 100% musically satisfying, and be the last headphone amplifier any of us might need to own." (Vol.47 No.2 WWW) Focal Utopia: $4999
The fully open-backed, circumaural Focal Utopias are designed around proprietary beryllium-dome full-range drivers that, uniquely, have no voice coil formers: each coil is fastened directly to its dome, in a crease near its surround. The yokes are made of carbon fiber, and the earcups and headband are covered with lambskin. HR described the Utopias as capable of producing "a gut-level realism that is rare in high-end audio," adding that the Focals are "lightning-fast, extremely open, and profoundly uncolored." In May 2023 HR compared the original Utopia headphones with the revised 2022 version. The new version offers different cosmetics with less silver trim, more open-looking "honeycomb" inner and outer grilles, and a new lighter-weight, more stylish yoke made from "forged recycled carbon." The new inner grilles are M-shaped, conforming to the shape of the M-shaped driver but the most important change is to the Utopia's voice coils, which are now made of 30% copper "to improve reliability" and 70% aluminum, "to reduce weight." Compared to its predecessor, HR noted, the 2022 Utopia "exhibits a more complete transparency, a quicker, higher bounce, and a more assured way with momentum." (Vol.39 No.10, Vol.41 No.6, Vol.46 No.5 WWW) HiFiMan HE-R10P: $5499
The HE-R10P is a wooden closed-back headset with "Supernano" planar-magnetic diaphragms. "When I first tried the HE-R10P," HR wrote, "my brain knew instantly that this headphone was excavating something more, some subtle type of extra information I usually don't experience with headphones." This extra information gave him a feeling of harmonic completeness and the R10P produced "a crisp, Kodacolored soundscape." The HE-R10P's high-rez, full-color detail reminded him of HiFiMan's $6k Susvara open-backs: "It felt totally grainless; with every compositional element, every individual instrument, all vocal tones, as well as all the air in the room assembled into something that felt perfect in scale and natural order. The more I listened, the more frequently the words 'flawlessly balanced' passed through my mind." Overall, the HE-R10P created the most coherent, tangible, of-one-piece spatial perspective HR had experienced with headphones, whether closed- or open-backed. (Vol.46 No.8 WWW)
HiFiMan Susvara headphones: $6000 ★
The HiFiMan Susvaras are over-the-ear headphones with planar-magnetic drivers, built around gold-coated Nanometer Grade diaphragms—their thinnest ever, the company claims. The drivers also use HiFiMan's Stealth Magnet grids, the individual magnetic strips of which have rounded edges to reduce interference with sound output. The Susvaras weigh 15.9oz and offer an impedance of 60 ohms and a sensitivity of only 83dB. HR later wrote that he thinks the Susvara is a contender for the world's best headphones. However, when he auditioned the Susvaras with the LTA Z10e amplifier, he found that, with the combination of low impedance and low sensitivity, the Susvara needed more power than the amplifier could deliver. Subsequently though, that amplifier was updated to provide its full available power—10Wpc—to headphones. (Vol.40 No.12, Vol.43 No.5, Vol.45 No.7 WWW) JPS Labs Abyss AB-1266 Phi TC: $5995-$8995 ★
For those who regard the JPS Abyss AB-1266 Phi headphones as prohibitively expensive, HR offers perspective, suggesting that they, like such "notorious legacy products" as the Wilson Audio WAMM loudspeaker of 1983 and the Audio Note Ongaku amplifier of 1993, "exist in categories of price and performance all their own." The Abyss 'phones are built into black-anodized aluminum frames and use single-magnet planar-magnetic drivers separated from the wearer by rotatable lambskin earpads held in place with magnets. Specs include a sensitivity of 88dB and an impedance of 42 ohms. After listening to a Schoenberg piece through the Abysses driven by the Woo WA5 headphone amp, HR reported: "I scribbled the phrase 'perfectly natural' several times. I never felt more kindred or connected to Schoenberg." He also suggested that the Abysses "delivered detail and soundstage images with an uncannily visual—nay, infinite—depth of field." HR later wrote that "The amazing part of the Abyss Phi TC 'phones is their complete absence of diaphragm breakup or modulation noise: They are the quietest speaker drivers I've ever heard. With the right amp, the AB-1266 'phones feel like they strip everything away between me and a recording." (Vol.40 No.8, Vol.43 No.5, Vol.44 No.10 WWW) Meze Audio Elite: $4000
The planar-magnetic drivers used in these open-back headphones feature a proprietary diaphragm/magnet assembly that Meze calls an "Isodynamic Hybrid Array." The ultrathin, biaxially oriented, semicrystalline polymer diaphragm weighs only 0.11gm and is driven by two driver coils to give a specified sensitivity of 101dB/mW with an impedance of 32 ohms. The Elite comes with two different earpads, one leather, the other made from a hybrid material and with a higher volume chamber. Despite the hybrid pads eliminating a slight bloom that shadowed the lower midrange with the shallower, all-leather pads, HR preferred the leather pads because he revels in "deep transparent spaces and luminous darknesses." Compared with his reference RAAL ribbons, the Meze sounded "smoother, more nuanced, kinder to singers, and easier on the mind." Compared with the Dan Clark Stealth headphones, the Meze Elite "did a better job transmitting the subtler aspects of vocal and instrumental tone and allowed vocalists to sound more like themselves." (Vol.45 No.9 WWW)
Raal-requisite SR-1b: $3450
With Ribbon amp interface: $4200
Described by HR as headphones that will satisfy "headphone connoisseurs and stubborn contrarians" alike, the off-the-ear RAAL-requisite SR1a's have a physical design that prevents them from covering or putting pressure on your pinnae: Their sound character is not determined in any way by a padded acoustical chamber around the listener's ears. Electrically, the SR1a's are built using open-baffle ribbon drivers, the very low impedance of which force the need for an impedance-matching box (included) and a 50–150Wpc loudspeaker amplifier (not included). Herb had his best results driving the RAAL-requisite 'phones with solid state amps and said of the SR1a/Pass XA25 amp combo, "No matter what hi-fi you have, it's unlikely to dig deeper and find more beauty in your recordings." When he tried the SR1a's with the Schiit Jotenheim R amplifier, HR commented that "The more I've used the SR1a, the more I've realized they reproduce recordings with unprecedented levels of musical texture and tactility" and concluded "No headphone images anywhere near as accurately or spectacularly as the SR1a, period." (Vol.43 Nos.1 & 7 WWW, Vol.44 No.10) Stax SR-X9000: $6200
This electrostatic headphone uses a diaphragm made from ultra-thin engineering film and is 20% larger than that of the previous Stax flagship, the SR-009S. Driving the Stax with Linear Tube Audio's Z10e amplifier, HR found that the soundspace the headphones generated "was full and complete, perfectly mapped, and cram-packed with delectable detail." With the same amplifier, he found that the SR-X9000 played very slightly brighter, more upfront, more distinctly detailed, and a tiny bit more physical than HiFiMan's Susvara planar-magnetic openbacks. "The Stax's upfrontness made the Susvara sound darker and deeper-spaced, more misty-humid than I usually perceive it to be," he wrote. With both the Z10e and Woo's 3ES amplifiers, HR concluded that the SR-X9000 "displayed greater microscopic resolution than every other transducer I have in-house including my ultimate reference, the JPS Labs Abyss AB-1266 Phi TC." (Vol.45 No.3 WWW) A: Ampsandsound Red October: $13,000
Ampsandsound Red October XL: $19,000
The low-gain, zero-feedback, dual-mono, single-ended triode Red October headphone amplifier uses a 300B tube for each channel's transformer-couple output, these driven driven by a single 12AX7 double triode. As well as a volume control, there are five headphone outputs on the front panel, with impedances of 8, 16, 32, 100, and 300 ohms, respectively. The Red October can be switched between the headphone outputs and its 8 ohm speaker outputs with a rear-mounted rocker switch. AH auditioned the Ampsandsound with four sets of cans—the Audeze LCD-3, the Sennheiser HD 650, the HiFiMan HE-R10P, and the Meze Elite—and noted that it imbued the sound with tonal richness, huge dynamic kick, and—with cans that allowed it—wide, out-of-the-head imaging. He reveled in the Red October's reassuring control and lack of strain. The more expensive Red October XL differs from the smaller amp by having larger, more complex output transformers, with more interleaving and 30W cores. AH wrote that listening to the Mezes through the XL "turned out to be among the most exciting experiences I've had with something clamped to my head." AH also used both amplifiers with the high-sensitivity Klipsch La Scala speakers, noting with the Red October that he was floored by the rock-solid grip the amp had on the speakers, its precise pace and timing, and the prodigious, taut bass. "The saturated colors I heard through headphones were just as evident with the La Scalas, and the music had scads of presence, weight, and body," he wrote. With the Red October XL powering the Klipsch speakers the XL "proved most obviously different from its smaller sibling in the incredibly specific way it portrayed textures, which seemed to glisten, imbued with uncanny presence, liquidity, and an almost endless array of tone colors. The sound was bigger, airier, and more dynamic, with a surer depiction of space." (Vol.47 No.11 WWW)
Audeze LCD-X: $1199 (travel case included) ★
These large, luxurious, circumaural headphones have planar-magnetic drive-units with a thin-film diaphragm energized by arrays of powerful neodymium magnets on both sides. They employ Audeze-patented Fazor elements, claimed to guide and manage the flow of sound in the headphone. The circular drivers are housed in polished, black-anodized aluminum earpieces cushioned with generously sized foam pads covered in lambskin or leather-free microsuede. Adjustment is via notched, chromed metal rods attached to each earpiece, which fit into the sprung, leather-clad headband. The LCD-Xes produced a seductive, compelling sound with precise imaging, rich mids, smooth highs, and clean bass, JA said. Compared to his longtime reference Sennheiser HD 650s, the LCD-Xes resolved more detail, produced the more convincing sense of recorded ambience, and provided deeper bass. "Highly recommended!" JA concluded. HR found that the Audezes driven by the Schiit Jotunheim "gave reproduced music life and brilliance." "Creator Special" edition (without travel case) costs $1199. (Vol.37 No.3, Vol.41 No.6, Vol.43 No.7 WWW) Benchmark HPA4 headphone amplifier: $3499 w/o remote; $3599 with remote ★
The HPA4 adds a THX888 amplification stage to Benchmark's LA4 line preamplifier (see "Preamplifiers") to allow it to drive even low-impedance headphones with aplomb. It keeps the LA4's balanced and single-ended preamplifier outputs and adds a headphone output on a 4-pin XLR jack and a single-ended headphone output on a 1/4" jack. HR noted that with the hard-to-drive HiFiMan Susvara headphones, the HPA4 "showed each instrument in dramatic bas-relief. It accomplished this by presenting cleaner, better-articulated bass and manufacturing a sharper midrange focus than I had experienced previously with either my solid state reference, the Pass Labs HPA-1, or the tubed Linear Tube Audio Z10e." With the JPS Labs Abyss AB-1266 Phi TCs driven by the HPA4, "deep bass emerged with great volume and energy." "My romantic-dreamer mind adapted surprisingly well to the Benchmark HPA4's presentation," HR concluded. "The more I used the HPA4 to drive high-resolution headphones, the more comfortable I felt with its precise, pro-audio recording-studio aesthetic." JA noted that the the LA4 preamplifier was "the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I had encountered at that time. … To those virtues, the HPA4 adds equally superb balanced and single-ended headphone outputs." Optional remote costs $100. (Vol.44 No.2 WWW) Beyerdynamic DT 1770 MKII: $599
Beyerdynamic DT 1990 MKII: $599
These two identically priced headphones sport polymer "Tesla.45" diaphragms, have a 30 ohm impedance, and a 95dB/mW sensitivity at 500Hz, and are distinguished by being open-back (1990) or closed-back (1770) designs. Both are supplied with two types of ear pads: "Producing Velours" (which have a touch of bass boost) are fitted as standard; the "Mixing & Mastering Velours" offer "a more analytical sound." When HR auditioned the DT 1990 with the "Producing Velours," the bass was "agreeably full, round, and smooth, though the bass sounded uncertain, as it does on many ported box speakers." When he switched to the "Mixing & Mastering Velours," the bass sounded more "sealed box," meaning it didn't appear to go as low but seemed to roll off more uniformly below 100Hz. The DT 1770 presented recordings in a slightly brighter, purer, larger manner than the DT 1990, sounding more neutral and transparent. HR described both headphones as "bargains," commenting that they sound "as honest, professional, and modern as they look. Earnestly recommended." (Vol.48 No.3 WWW)
Eleven Audio (Xiaudio) Broadway headphone amplifier: $2599
The small, unglamorous looking Broadway is specified to output 1.5Wpc into 32 ohms in full, differential-balanced class-A. Its only input is balanced (XLR), and its two outputs are both balanced: 4-pin XLR and 4.4mm Pentaconn. A wallwart supply/charger is provided and the four user-replaceable, 3000mAh, 3.7V Li-ion batteries power the amplifier for up to six hours. HR used the Broadway to compare the Abyss Diana TC with the Abyss AB-1266 and Meze Elite headphones. The sonic signatures of all three were readily revealed. (Vol.46 No.5 WWW) Ferrum OOR: $1995
Class A only when used with Ferrum Hypsos power supply; otherwise Class B. DC-coupled, fully balanced headphone amplifier/preamplifier—single-ended input signals are converted to balanced—with adjustable maximum gain and four-pin XLR and ¼" headphone outputs. Used as a preamplifier, the OOR reminded HR of "a middleweight boxer landing quick hard jabs; in music (not boxing), this quality emphasized tempo changes, plucked notes, and short pauses in the performance stream." Used as a headphone amplifier with JPS Labs Abyss AB-1266 Phi TC 'phones, the OOR reproduced a Huddie Ledbetter recording with the sound of Huddie's voice and guitar "taut, well-defined, and clear as clear can be." Adding Ferrum's HYPSOS supply—see Powerline Accessories—ameliorated some dryness and grayness that had been evident on Ledbetter's voice. HR concluded that the OOR/HYPSOS combo "will drive any headphones effortlessly while preserving the soul and essence of the music they amplify." (Vol.45 No.2 WWW) Focal Stellia: $2999 ★
When he first heard these closed-back headphones, which use 1.5" M-shaped electrodynamic beryllium-dome drivers and have a 35 ohm impedance, HR felt that they "were delivering a very high level of relaxed and refined sound, with no beryllium metallic-ness." Continued listening with the Feliks Euforia amplifier resulted in "more excitement and colorful energy" than with the Auris Nirvana powering the Focals. HR concluded that with the HoloAudio May DAC and the Euforia, "Focal's Stellia closed-backs produced vital, exciting sound." (Vol.43 No.10 WWW)
HeadAmp GS-X mini Balanced: $1795
The first HeadAmp product to "deliver balanced headphone drive from all sources, single-ended or balanced," the GS-X Mini offers potentiometer or optional stepped-attenuator volume controls and is specified to output 6W of power into a 25 ohm load. HR found that this solid state amplifier made clear the sonic differences between the headphones with which he used it. Compared with the considerably more expensive, tubed Felix Envy, HR found that the GS-X Mini made music feel unnecessarily tight and tidy in a way that limited expansiveness and atmosphere. "The Mini is extremely transparent and handles reverb very nicely," he wrote, "but it hits that old 'transistor ceiling' when reproducing tone color, microtextures, and the empty spaces between sounds." (Vol.45 No.9, Vol.47 No.2 WWW) HiFiMan Audivina: $1999
This closed-back, planar-magnetic headphone distinguishes itself visually from HiFi Man's "round" R10 models by its bright wooden ovoid cups. HR found the Audivana offered a "more sun-soaked sound" than the R10P. "The Audivina not only play bright and clear, it brought sparkle to the eye," he wrote, adding that the Audivina "let the voice of a singer like Natalie Dessay soar and swing and only disappoint you if you're waiting for a bad note or a top-octave flair-out. The entire range of Dessay's voice was reproduced with a riveting, delirium-inducing beauty." He concluded that "never for a moment would I have traded the Audivina's tonal purity and state-of-the-art transparency for whatever spatial effects an open-back headset might offer." (Vol.46 Nos.7 & 8 WWW) HiFiMan HE-R10D: $599
The R10D closed-back, planar-magnetic headset looks exactly the same as the more-expensive R10P except that the R10P is made of a darker, heavier wood. (The R10D weighs only 337gm compared with the R10P's 460gm.) HR found that the R10D took a while to break in, but when it did, it was possibly the sweetest, smoothest, most all-natural-sounding headphone anywhere near its price. The R10D excelled on all types of female vocals, HR concluded. (Vol.46 No.8 WWW)
iFi Audio ZEN CAN Signature: $599 with ZEN DAC Signature V2
Packaged with the ZEN DAC Signature V2—see Digital Processors—this headphone amplifier is available in two versions: the 6XX, which includes equalization to optimize the sound of the Sennheiser x Drop HD 6XX and HD 650 headphones; and the HFM, which has equalization for the HiFiMan x Drop HE4XX 'phones. Apart from the different EQ curves, the two versions contain identical circuitry, and the EQ can be bypassed for use with other headphones. The ZEN CAN also includes iFi's XSpace feature, which is intended to expand the perception of space and project the music outside your head. The amplifier offers four choices of maximum gain, from 0dB to 18dB from the single-ended outputs, 6–24dB from the balanced outputs. JMu found that even with the lowest gain setting, the ZEN DAC Signature's balanced output was too "hot." She found that using iFi's iEMatch attenuating balanced cable ($49) gave a better gain match between the two iFi Signature products, though JCA didn't find the attenuator cable necessary with the same headphones. JMu auditioned both versions of the ZEN CAN with the appropriate headphones. With the EQ, she heard sharper transient attacks, more air and presence, and more detail and clarity, adding that "yes, the EQ curve obviously boosts the bass," which correlates with JA's measurements. JCA found that the effect of the CANs' custom EQ wasn't dramatic, but it was positive, especially with the HiFiMan headphones, which could sound a bit woolly without it. Without EQ, JMu found that "tonal balance with the ZEN set seemed extended and neutral, with rare hints of brightness." JMu concluded that the ZEN Signature sets "offer impressive sound quality—and a bit of style—for not a lot of money." (Vol.45 Nos.1 & 3 WWW) Linear Tube Audio Z10e: $6950
The all-tube Z10e integrated amplifier/headphone amplifier/electrostatic headphone amplifier is built around a David Berning–designed, push-pull, output-transformerless (OTL) EL84-tube power amplifier that is rated at 12Wpc into 8 ohms and 13Wpc into 4 ohms. "The Z10e is a distilled, shape-shifted version of the Z10, designed to appeal to today's new breed of headphone collector-connoisseurs," HR wrote. It also has a five-pin, 580V-energized output to drive Stax electrostatic headphones. Though he liked how this amplifier sounded with high-sensitivity DeVore and Zu loudspeakers, he mostly used it with a variety of headphones. The Z10e got the best from Abyss AB-1266 Phi TC, Focal Clear, and ZMF Vérité Closed dynamic headphones and excelled with Stax SR-009S and Dan Clark Voce electrostatics. Herb found it wasn't powerful enough to drive the demanding HiFiMan Susvaras, but then it was upgraded to deliver the full 10Wpc to headphones. After the update, it reproduced low frequencies that were "delectably large." HR summed up the revised amplifier by saying, "The LTA Z10e/Susvara combo missed no beats, showed no weaknesses, and kept my head bopping. . . . The Z10e amp displayed no hesitations, dullness, or clipping; no smoke from the tires, no engine stalling—only full-traction, high-torque engagement." With the Audeze CRBN headphones, the Z10e's "overall timbre and tone were just right and satisfyingly color-saturated." Compared with the Feliks Envy using HiFiMan's easy-to-drive, closed-back R10P planar magnetics, HR noted that the Z10e sounded slightly warmer with a slightly less-sharp focus. (Vol.43 No.5, Vol.44 No.2, Vol.45 Nos.1 & 3, Vol.47 No.2 WWW) Meze Audio 109 Pro: $799
HR found that these elegant-looking dynamic headphones deliver a major portion of the Romanian company's flagship Elite's "seductive resolve." Source impedance is 40 ohms, and the drivers use a 50mm beryllium-coated polymer, cellulose/carbon-fiber composite and copper-zinc alloy diaphragm. With every amplifier he tried, HR wrote that the 109 "exhibited a perfect right-brain/left-brain balance; beautiful sound and musical insight were celebrated equally." Playing The Barbra Streisand Album, from 1963, HR noted that the 109s powered by the Feliks Envy amplifier "conveyed every eager breath of Streisand's fresh-faced exuberance." With ARCAM's A25 integrated amplifier, he summed up the 109s as "exquisitely balanced tone-wise." (Vol.47 No.4 WWW)
Naim Uniti Atom HE: $3799
The "Headphone Edition" of Naim's Uniti Atom streaming D/A integrated amplifier, the Atom HE features both single-ended and balanced headphone outputs as well as a preamplifier output. Inputs include a single unbalanced analog on RCA and digital—two TosLink S/PDIF, one coaxial S/PDIF, USB, Ethernet, and Bluetooth (aptX). Control is via buttons next to the front-panel display, Naim's iOS and Android apps, or with Roon. Used as a D/A preamplifier, the Atom impressed HR: It reproduced the body and reverberant character of a piano as graphically and completely as his Rogue RP-7 preamp sourced by the dCS Bartók. "That, folks, is saying a lot," he wrote. With the Atom HE powering the easy-to-drive, low-impedance (35 ohms), high-sensitivity Focal Stellia headphones, HR felt the sound was "squeaky-clean, bass-taut, and superdynamic lively." After five weeks of auditioning the Uniti Atom HE with a variety of headphones, HR concluded that its best and most obvious trait "was how gracefully and insightfully it danced through one musical genre after another. It was never not enticing. It was never not engaging. It never disappointed." However, he did caution that the Atom HE plays best with headphones with a sensitivity of 88dB/mW or higher. HR subsequently used the Uniti Atom to compare the 2020 and 2022 versions of Focal's Utopia headphones. (Vol.44 No.9, Vol.46 No.5 WWW) Sennheiser HD 650: $499.95 ★
The HD 650s are an evolution of Sennheiser's very successful HD 600 open-back dynamic headphones, claimed to provide superior results due to hand-selected parts with closer tolerances and the use of a specially developed acoustic silk for the driver diaphragms. Compared to the Grado SR325i, the Sennheisers sounded richer but slightly darker. JM found that their very effective seal created a resonant cavity that produced "bass that is both quite deep and a trifle indistinct." JA's new reference cans. Compared to the Audeze LCD-Xes, the HD650s had a similar overall sound, but lacked bass control, detail resolution, and ambience retrieval, said JA. (Vol.28 No.6, Vol.31 No.9, Vol.37 No.3 WWW) Warwick Acoustics Bravura: Silver finish $6995;
with "Black Edition" finish: $7795
This British electrostatic system includes a D/A-energizer/amplifier. The headphones use patented membrane technology that employs a thin laminated film affixed to an open, eight-cell insulating spacer made of Formex. HR described the Bravura's sound quality as "clearly stated, tight and strong of bass, and rhythmically forceful, with good body and timbre." He concluded that "The Bravura's unbypassable digital processing made it impossible for me to say anything verifiable about how Warwick Acoustics' newest electrostatic headphone system compares to any other electrostatic headphone you might be familiar with. But my diverse listening experiments lead me to conclude that, for anyone seeking a handsome, comfortable, reasonably priced, substantially built, exceptional-sounding entry into the realm of electrostatic headphones, the Bravura is a must audition." (Vol.45 No.7 WWW)
Woo Audio 3ES: $8999 (standard version)
Two-chassis, 53lb headphone amplifier with XLR and RCA inputs but only balanced outputs, which doubles as a preamplifier. Standard-version tube lineup is four Psvane 300B directly heated triodes, two Russian-made 6SN7 dual triodes, and a single (Russian) 5U4G rectifier tube. Elite edition ($11,699, not reviewed) offers upgraded components. As a preamplifier, compared with HR's reference Rogue RP-7 the 3ES was "more spirited, more physical, more locomotive-rolling-forward." As a headphone amplifier—it can drive both dynamic and electrostatic headphones—HR found that with Audeze CRBNs the Woo produced sounds that "were exquisitely formed, distinctly visual, and exceptionally three-dimensional." With the Stax SR-X9000 electrostatics, the 3ES emphasized the speed and timing of the groove, though it sounded cooler and dryer than the Linear Tube Audio Z10e, with less detail. (Vol.45 Nos.1 & 3 WWW) B: Focal Bathys: $699
These closed-back headphones offer active noise cancellation and can be used with or without wires. Without wires, the Bathys uses Bluetooth 5.1; with wires, it uses USB-C. (While the USB-C connection works natively with Android devices, iOS devices need Apple's "Camera Kit" Lightning-to-USB dongle, along with a USB-C–to–USB-A adapter.) The built-in DAC supports PCM audio up to 24/192. Controls are placed on the right-hand cup; as well as power on/off and source selection, these offer three noise-cancellation choices, can summon Amazon Alexa, Google Assistant, or Apple's Siri, and even operate a hearing test, with the supplied Mimi app, to tailor the headphones' equalization for the user's hearing. In Bluetooth mode, even without EQ or Mimi, RvB found the sound of the Bathys "impactful, punchy, and convincing." He noted that detail retrieval was especially excellent on acoustic instruments and vocals, male voices sounded natural and not overly chesty, and transients were "extraordinary" for 'phones with dynamic drivers. (Vol.47 No.2 WWW) C: Apple AirPod Pro 2: $249/pair
Although the new Bluetooth 5.3 standard implemented in the Pro 2 can handle lossless streaming, Apple sticks to its own AAC codec for this noise-canceling wireless in-ear monitor. RvB commented that in terms of convenience and thoughtful touches, the AirPod Pro 2 made the ownership experience second to none—"awe-inspiring, in fact." An interactive ear test lets you tailor the Pro 2's sound to your ears and compensate for hearing deficiencies. Additionally, you can engage Personalized Spatial Audio after using your iPhone's TrueDepth camera to measure your face and each ear, yielding a unique earprint. Although the full noise-canceling mode is best for use in noisy surroundings, RVB preferred the Transparency mode, which lets in a small portion of the room's environmental sound. "Overall, I found the music a bit more spacious with Transparency turned on, " he wrote. He concluded that while he had mixed feeling about the spatial audio surround-sound performance—it worked well with Atmos-encoded movie soundtracks but he found it mildly annoying with some music—he admired the AirPod Pro 2 for how well-thought-out it was, and loved how cleverly the pair was integrated with Apple iOS devices. (Vol.46 No.3 WWW)
Deletions
Audeze CRBN, replaced. JPS Labs Abyss Diana TC, discontinued. Questyle Audio M12, discontinued. AudioQuest DragonFly Cobalt, JA hasn't used it "in a couple of years". ampsandsound Bigger Ben, Focal Clear Mg, Pass Labs HPA-1, not auditioned in a long time.
The open-back LCD-5 is the successor to Audeze's well-regarded LCD-4 and, like its predecessor, uses planar-magnetic drive units, which feature proprietary, single-sided Fluxor neodymium N50 magnet arrays and a voice-coil concept called Parallel Uniforce. The idea is to vary the width of the conductor to match, or counter, variations in the magnetic flux to achieve uniform force across the membrane. The 90mm diaphragm is just 0.5 microns thick. JMu wrote that whatever source/amplifier setup she used, aspects of the LCD-5's signature sound seemed consistent: air, spaciousness, and openness combined with copious fine detail. "Live recordings sounded live; well-made studio recordings sounded alive, with sufficient energy and detail to seem real," she commented. (Vol.46 No.12 WWW) Dan Clark Audio Stealth: $3999.99
The Stealth weighs 415gm and presents a low (23 ohm) impedance and a low (86–87dB/mW) sensitivity. HR was impressed by these closed-back, planar-magnetic headphones, which feature a patent-pending Acoustic Metamaterial Tuning System (AMTS)—an intricately formed, waferlike partition situated between the driver diaphragm—and the deeper-than-average ear cavity. He wrote that the Stealth's sound was "clear, finely detailed, and extremely well-balanced" though he also noted that it was also "somewhat distant," lacking some high-frequency directness compared with the HiFiMan Susvara open-back planar-magnetics. However, he found that the Stealth's upper bass and lower midrange were tauter, fuller, and more vividly portrayed than the Susvara's, a balance that worked well with female vocals. He concluded that the Stealth's most prominent virtues were its comfortable fit, its extraordinary build quality, its elegant way with detail, and its marvelously balanced, low-fatigue presentation. (Vol.45 No.7 WWW) dCS Bartók APEX Upsampling DAC/Network Streamer: $22,950 incl. headphone amp
See "Digital Processors." dCS Lina Headphone Amplifier: $9750
This British, solid state, class-AB headphone amplifier is specified as outputting 2W into 30 ohms and 0.48W into 300 ohms with balanced 'phones, or 1.6W into 30 ohms and 0.2W into 300 ohms with unbalanced. There are three pairs of stereo analog inputs: one unbalanced; one balanced and buffered (high-impedance); and one "unbuffered" balanced for use with low-impedance source components. There are three headphone outputs: two 3-pin XLR—one each for right and left channels—one 4-pin XLR; and one ¼" jack. With HiFiMan's HE R10P, HR found the sound was "sharp, lucid, and emotionally affecting." With JPS Labs' Abyss AB-1266, he noted that the presentation was a touch dry compared to the tubed Feliks Envy and LTA Z10e amplifiers "but well-formed, brisk, and super-transparent, with assertive beat-keeping and state-of-the-art vocal intelligibility." Compared with the Feliks Envy, the Lina's overt transparency made the Envy seem hazy. Overall, "the Lina presented performers' images with a sculpted mass that contrasted with the Envy's gentler, more holographic presentation." (Vol.47 No.3 WWW)
This moderate-sized, single-ended headphone amp from Poland uses Psvane CV-181 (6SN7) twin-triode driver tubes and either Electro-Harmonix Gold 300B output tubes (standard version) or TJ Full Music 300B output tubes (Performance Edition). Specified output power is 8Wpc. There are three analog inputs, one balanced using transformers and two unbalanced (RCA). In addition to balanced and single-ended preamp-level outputs, there are two headphone jacks, one of them balanced. The gain can be set to three different levels, and HR found that at the Envy's highest gain setting with the TJ Full Music 300Bs, "it made the famously hard-to-drive HiFiMan Susvaras light up and sing, with great purity and feeling." With ZMF's sensitive Verité closed-back headphones, HR used the Envy's middle gain setting and noted that "beauty and boogie combined forces to make focused listening easy." He also used the Electro-Harmonix 300Bs and concluded that some users might prefer the E-H's "earthbound realism over the slightly fuller, marginally more fantastic-sounding Full Music 300Bs." Overall, with every headphones he tried, the Envy "performed as though it had been engineered to present recordings in the most vivid manner possible, be 100% musically satisfying, and be the last headphone amplifier any of us might need to own." (Vol.47 No.2 WWW) Focal Utopia: $4999
The fully open-backed, circumaural Focal Utopias are designed around proprietary beryllium-dome full-range drivers that, uniquely, have no voice coil formers: each coil is fastened directly to its dome, in a crease near its surround. The yokes are made of carbon fiber, and the earcups and headband are covered with lambskin. HR described the Utopias as capable of producing "a gut-level realism that is rare in high-end audio," adding that the Focals are "lightning-fast, extremely open, and profoundly uncolored." In May 2023 HR compared the original Utopia headphones with the revised 2022 version. The new version offers different cosmetics with less silver trim, more open-looking "honeycomb" inner and outer grilles, and a new lighter-weight, more stylish yoke made from "forged recycled carbon." The new inner grilles are M-shaped, conforming to the shape of the M-shaped driver but the most important change is to the Utopia's voice coils, which are now made of 30% copper "to improve reliability" and 70% aluminum, "to reduce weight." Compared to its predecessor, HR noted, the 2022 Utopia "exhibits a more complete transparency, a quicker, higher bounce, and a more assured way with momentum." (Vol.39 No.10, Vol.41 No.6, Vol.46 No.5 WWW) HiFiMan HE-R10P: $5499
The HE-R10P is a wooden closed-back headset with "Supernano" planar-magnetic diaphragms. "When I first tried the HE-R10P," HR wrote, "my brain knew instantly that this headphone was excavating something more, some subtle type of extra information I usually don't experience with headphones." This extra information gave him a feeling of harmonic completeness and the R10P produced "a crisp, Kodacolored soundscape." The HE-R10P's high-rez, full-color detail reminded him of HiFiMan's $6k Susvara open-backs: "It felt totally grainless; with every compositional element, every individual instrument, all vocal tones, as well as all the air in the room assembled into something that felt perfect in scale and natural order. The more I listened, the more frequently the words 'flawlessly balanced' passed through my mind." Overall, the HE-R10P created the most coherent, tangible, of-one-piece spatial perspective HR had experienced with headphones, whether closed- or open-backed. (Vol.46 No.8 WWW)
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The HiFiMan Susvaras are over-the-ear headphones with planar-magnetic drivers, built around gold-coated Nanometer Grade diaphragms—their thinnest ever, the company claims. The drivers also use HiFiMan's Stealth Magnet grids, the individual magnetic strips of which have rounded edges to reduce interference with sound output. The Susvaras weigh 15.9oz and offer an impedance of 60 ohms and a sensitivity of only 83dB. HR later wrote that he thinks the Susvara is a contender for the world's best headphones. However, when he auditioned the Susvaras with the LTA Z10e amplifier, he found that, with the combination of low impedance and low sensitivity, the Susvara needed more power than the amplifier could deliver. Subsequently though, that amplifier was updated to provide its full available power—10Wpc—to headphones. (Vol.40 No.12, Vol.43 No.5, Vol.45 No.7 WWW) JPS Labs Abyss AB-1266 Phi TC: $5995-$8995 ★
For those who regard the JPS Abyss AB-1266 Phi headphones as prohibitively expensive, HR offers perspective, suggesting that they, like such "notorious legacy products" as the Wilson Audio WAMM loudspeaker of 1983 and the Audio Note Ongaku amplifier of 1993, "exist in categories of price and performance all their own." The Abyss 'phones are built into black-anodized aluminum frames and use single-magnet planar-magnetic drivers separated from the wearer by rotatable lambskin earpads held in place with magnets. Specs include a sensitivity of 88dB and an impedance of 42 ohms. After listening to a Schoenberg piece through the Abysses driven by the Woo WA5 headphone amp, HR reported: "I scribbled the phrase 'perfectly natural' several times. I never felt more kindred or connected to Schoenberg." He also suggested that the Abysses "delivered detail and soundstage images with an uncannily visual—nay, infinite—depth of field." HR later wrote that "The amazing part of the Abyss Phi TC 'phones is their complete absence of diaphragm breakup or modulation noise: They are the quietest speaker drivers I've ever heard. With the right amp, the AB-1266 'phones feel like they strip everything away between me and a recording." (Vol.40 No.8, Vol.43 No.5, Vol.44 No.10 WWW) Meze Audio Elite: $4000
The planar-magnetic drivers used in these open-back headphones feature a proprietary diaphragm/magnet assembly that Meze calls an "Isodynamic Hybrid Array." The ultrathin, biaxially oriented, semicrystalline polymer diaphragm weighs only 0.11gm and is driven by two driver coils to give a specified sensitivity of 101dB/mW with an impedance of 32 ohms. The Elite comes with two different earpads, one leather, the other made from a hybrid material and with a higher volume chamber. Despite the hybrid pads eliminating a slight bloom that shadowed the lower midrange with the shallower, all-leather pads, HR preferred the leather pads because he revels in "deep transparent spaces and luminous darknesses." Compared with his reference RAAL ribbons, the Meze sounded "smoother, more nuanced, kinder to singers, and easier on the mind." Compared with the Dan Clark Stealth headphones, the Meze Elite "did a better job transmitting the subtler aspects of vocal and instrumental tone and allowed vocalists to sound more like themselves." (Vol.45 No.9 WWW)
With Ribbon amp interface: $4200
Described by HR as headphones that will satisfy "headphone connoisseurs and stubborn contrarians" alike, the off-the-ear RAAL-requisite SR1a's have a physical design that prevents them from covering or putting pressure on your pinnae: Their sound character is not determined in any way by a padded acoustical chamber around the listener's ears. Electrically, the SR1a's are built using open-baffle ribbon drivers, the very low impedance of which force the need for an impedance-matching box (included) and a 50–150Wpc loudspeaker amplifier (not included). Herb had his best results driving the RAAL-requisite 'phones with solid state amps and said of the SR1a/Pass XA25 amp combo, "No matter what hi-fi you have, it's unlikely to dig deeper and find more beauty in your recordings." When he tried the SR1a's with the Schiit Jotenheim R amplifier, HR commented that "The more I've used the SR1a, the more I've realized they reproduce recordings with unprecedented levels of musical texture and tactility" and concluded "No headphone images anywhere near as accurately or spectacularly as the SR1a, period." (Vol.43 Nos.1 & 7 WWW, Vol.44 No.10) Stax SR-X9000: $6200
This electrostatic headphone uses a diaphragm made from ultra-thin engineering film and is 20% larger than that of the previous Stax flagship, the SR-009S. Driving the Stax with Linear Tube Audio's Z10e amplifier, HR found that the soundspace the headphones generated "was full and complete, perfectly mapped, and cram-packed with delectable detail." With the same amplifier, he found that the SR-X9000 played very slightly brighter, more upfront, more distinctly detailed, and a tiny bit more physical than HiFiMan's Susvara planar-magnetic openbacks. "The Stax's upfrontness made the Susvara sound darker and deeper-spaced, more misty-humid than I usually perceive it to be," he wrote. With both the Z10e and Woo's 3ES amplifiers, HR concluded that the SR-X9000 "displayed greater microscopic resolution than every other transducer I have in-house including my ultimate reference, the JPS Labs Abyss AB-1266 Phi TC." (Vol.45 No.3 WWW) A: Ampsandsound Red October: $13,000
Ampsandsound Red October XL: $19,000
The low-gain, zero-feedback, dual-mono, single-ended triode Red October headphone amplifier uses a 300B tube for each channel's transformer-couple output, these driven driven by a single 12AX7 double triode. As well as a volume control, there are five headphone outputs on the front panel, with impedances of 8, 16, 32, 100, and 300 ohms, respectively. The Red October can be switched between the headphone outputs and its 8 ohm speaker outputs with a rear-mounted rocker switch. AH auditioned the Ampsandsound with four sets of cans—the Audeze LCD-3, the Sennheiser HD 650, the HiFiMan HE-R10P, and the Meze Elite—and noted that it imbued the sound with tonal richness, huge dynamic kick, and—with cans that allowed it—wide, out-of-the-head imaging. He reveled in the Red October's reassuring control and lack of strain. The more expensive Red October XL differs from the smaller amp by having larger, more complex output transformers, with more interleaving and 30W cores. AH wrote that listening to the Mezes through the XL "turned out to be among the most exciting experiences I've had with something clamped to my head." AH also used both amplifiers with the high-sensitivity Klipsch La Scala speakers, noting with the Red October that he was floored by the rock-solid grip the amp had on the speakers, its precise pace and timing, and the prodigious, taut bass. "The saturated colors I heard through headphones were just as evident with the La Scalas, and the music had scads of presence, weight, and body," he wrote. With the Red October XL powering the Klipsch speakers the XL "proved most obviously different from its smaller sibling in the incredibly specific way it portrayed textures, which seemed to glisten, imbued with uncanny presence, liquidity, and an almost endless array of tone colors. The sound was bigger, airier, and more dynamic, with a surer depiction of space." (Vol.47 No.11 WWW)
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These large, luxurious, circumaural headphones have planar-magnetic drive-units with a thin-film diaphragm energized by arrays of powerful neodymium magnets on both sides. They employ Audeze-patented Fazor elements, claimed to guide and manage the flow of sound in the headphone. The circular drivers are housed in polished, black-anodized aluminum earpieces cushioned with generously sized foam pads covered in lambskin or leather-free microsuede. Adjustment is via notched, chromed metal rods attached to each earpiece, which fit into the sprung, leather-clad headband. The LCD-Xes produced a seductive, compelling sound with precise imaging, rich mids, smooth highs, and clean bass, JA said. Compared to his longtime reference Sennheiser HD 650s, the LCD-Xes resolved more detail, produced the more convincing sense of recorded ambience, and provided deeper bass. "Highly recommended!" JA concluded. HR found that the Audezes driven by the Schiit Jotunheim "gave reproduced music life and brilliance." "Creator Special" edition (without travel case) costs $1199. (Vol.37 No.3, Vol.41 No.6, Vol.43 No.7 WWW) Benchmark HPA4 headphone amplifier: $3499 w/o remote; $3599 with remote ★
The HPA4 adds a THX888 amplification stage to Benchmark's LA4 line preamplifier (see "Preamplifiers") to allow it to drive even low-impedance headphones with aplomb. It keeps the LA4's balanced and single-ended preamplifier outputs and adds a headphone output on a 4-pin XLR jack and a single-ended headphone output on a 1/4" jack. HR noted that with the hard-to-drive HiFiMan Susvara headphones, the HPA4 "showed each instrument in dramatic bas-relief. It accomplished this by presenting cleaner, better-articulated bass and manufacturing a sharper midrange focus than I had experienced previously with either my solid state reference, the Pass Labs HPA-1, or the tubed Linear Tube Audio Z10e." With the JPS Labs Abyss AB-1266 Phi TCs driven by the HPA4, "deep bass emerged with great volume and energy." "My romantic-dreamer mind adapted surprisingly well to the Benchmark HPA4's presentation," HR concluded. "The more I used the HPA4 to drive high-resolution headphones, the more comfortable I felt with its precise, pro-audio recording-studio aesthetic." JA noted that the the LA4 preamplifier was "the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I had encountered at that time. … To those virtues, the HPA4 adds equally superb balanced and single-ended headphone outputs." Optional remote costs $100. (Vol.44 No.2 WWW) Beyerdynamic DT 1770 MKII: $599
Beyerdynamic DT 1990 MKII: $599
These two identically priced headphones sport polymer "Tesla.45" diaphragms, have a 30 ohm impedance, and a 95dB/mW sensitivity at 500Hz, and are distinguished by being open-back (1990) or closed-back (1770) designs. Both are supplied with two types of ear pads: "Producing Velours" (which have a touch of bass boost) are fitted as standard; the "Mixing & Mastering Velours" offer "a more analytical sound." When HR auditioned the DT 1990 with the "Producing Velours," the bass was "agreeably full, round, and smooth, though the bass sounded uncertain, as it does on many ported box speakers." When he switched to the "Mixing & Mastering Velours," the bass sounded more "sealed box," meaning it didn't appear to go as low but seemed to roll off more uniformly below 100Hz. The DT 1770 presented recordings in a slightly brighter, purer, larger manner than the DT 1990, sounding more neutral and transparent. HR described both headphones as "bargains," commenting that they sound "as honest, professional, and modern as they look. Earnestly recommended." (Vol.48 No.3 WWW)
The small, unglamorous looking Broadway is specified to output 1.5Wpc into 32 ohms in full, differential-balanced class-A. Its only input is balanced (XLR), and its two outputs are both balanced: 4-pin XLR and 4.4mm Pentaconn. A wallwart supply/charger is provided and the four user-replaceable, 3000mAh, 3.7V Li-ion batteries power the amplifier for up to six hours. HR used the Broadway to compare the Abyss Diana TC with the Abyss AB-1266 and Meze Elite headphones. The sonic signatures of all three were readily revealed. (Vol.46 No.5 WWW) Ferrum OOR: $1995
Class A only when used with Ferrum Hypsos power supply; otherwise Class B. DC-coupled, fully balanced headphone amplifier/preamplifier—single-ended input signals are converted to balanced—with adjustable maximum gain and four-pin XLR and ¼" headphone outputs. Used as a preamplifier, the OOR reminded HR of "a middleweight boxer landing quick hard jabs; in music (not boxing), this quality emphasized tempo changes, plucked notes, and short pauses in the performance stream." Used as a headphone amplifier with JPS Labs Abyss AB-1266 Phi TC 'phones, the OOR reproduced a Huddie Ledbetter recording with the sound of Huddie's voice and guitar "taut, well-defined, and clear as clear can be." Adding Ferrum's HYPSOS supply—see Powerline Accessories—ameliorated some dryness and grayness that had been evident on Ledbetter's voice. HR concluded that the OOR/HYPSOS combo "will drive any headphones effortlessly while preserving the soul and essence of the music they amplify." (Vol.45 No.2 WWW) Focal Stellia: $2999 ★
When he first heard these closed-back headphones, which use 1.5" M-shaped electrodynamic beryllium-dome drivers and have a 35 ohm impedance, HR felt that they "were delivering a very high level of relaxed and refined sound, with no beryllium metallic-ness." Continued listening with the Feliks Euforia amplifier resulted in "more excitement and colorful energy" than with the Auris Nirvana powering the Focals. HR concluded that with the HoloAudio May DAC and the Euforia, "Focal's Stellia closed-backs produced vital, exciting sound." (Vol.43 No.10 WWW)
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The first HeadAmp product to "deliver balanced headphone drive from all sources, single-ended or balanced," the GS-X Mini offers potentiometer or optional stepped-attenuator volume controls and is specified to output 6W of power into a 25 ohm load. HR found that this solid state amplifier made clear the sonic differences between the headphones with which he used it. Compared with the considerably more expensive, tubed Felix Envy, HR found that the GS-X Mini made music feel unnecessarily tight and tidy in a way that limited expansiveness and atmosphere. "The Mini is extremely transparent and handles reverb very nicely," he wrote, "but it hits that old 'transistor ceiling' when reproducing tone color, microtextures, and the empty spaces between sounds." (Vol.45 No.9, Vol.47 No.2 WWW) HiFiMan Audivina: $1999
This closed-back, planar-magnetic headphone distinguishes itself visually from HiFi Man's "round" R10 models by its bright wooden ovoid cups. HR found the Audivana offered a "more sun-soaked sound" than the R10P. "The Audivina not only play bright and clear, it brought sparkle to the eye," he wrote, adding that the Audivina "let the voice of a singer like Natalie Dessay soar and swing and only disappoint you if you're waiting for a bad note or a top-octave flair-out. The entire range of Dessay's voice was reproduced with a riveting, delirium-inducing beauty." He concluded that "never for a moment would I have traded the Audivina's tonal purity and state-of-the-art transparency for whatever spatial effects an open-back headset might offer." (Vol.46 Nos.7 & 8 WWW) HiFiMan HE-R10D: $599
The R10D closed-back, planar-magnetic headset looks exactly the same as the more-expensive R10P except that the R10P is made of a darker, heavier wood. (The R10D weighs only 337gm compared with the R10P's 460gm.) HR found that the R10D took a while to break in, but when it did, it was possibly the sweetest, smoothest, most all-natural-sounding headphone anywhere near its price. The R10D excelled on all types of female vocals, HR concluded. (Vol.46 No.8 WWW)
Packaged with the ZEN DAC Signature V2—see Digital Processors—this headphone amplifier is available in two versions: the 6XX, which includes equalization to optimize the sound of the Sennheiser x Drop HD 6XX and HD 650 headphones; and the HFM, which has equalization for the HiFiMan x Drop HE4XX 'phones. Apart from the different EQ curves, the two versions contain identical circuitry, and the EQ can be bypassed for use with other headphones. The ZEN CAN also includes iFi's XSpace feature, which is intended to expand the perception of space and project the music outside your head. The amplifier offers four choices of maximum gain, from 0dB to 18dB from the single-ended outputs, 6–24dB from the balanced outputs. JMu found that even with the lowest gain setting, the ZEN DAC Signature's balanced output was too "hot." She found that using iFi's iEMatch attenuating balanced cable ($49) gave a better gain match between the two iFi Signature products, though JCA didn't find the attenuator cable necessary with the same headphones. JMu auditioned both versions of the ZEN CAN with the appropriate headphones. With the EQ, she heard sharper transient attacks, more air and presence, and more detail and clarity, adding that "yes, the EQ curve obviously boosts the bass," which correlates with JA's measurements. JCA found that the effect of the CANs' custom EQ wasn't dramatic, but it was positive, especially with the HiFiMan headphones, which could sound a bit woolly without it. Without EQ, JMu found that "tonal balance with the ZEN set seemed extended and neutral, with rare hints of brightness." JMu concluded that the ZEN Signature sets "offer impressive sound quality—and a bit of style—for not a lot of money." (Vol.45 Nos.1 & 3 WWW) Linear Tube Audio Z10e: $6950
The all-tube Z10e integrated amplifier/headphone amplifier/electrostatic headphone amplifier is built around a David Berning–designed, push-pull, output-transformerless (OTL) EL84-tube power amplifier that is rated at 12Wpc into 8 ohms and 13Wpc into 4 ohms. "The Z10e is a distilled, shape-shifted version of the Z10, designed to appeal to today's new breed of headphone collector-connoisseurs," HR wrote. It also has a five-pin, 580V-energized output to drive Stax electrostatic headphones. Though he liked how this amplifier sounded with high-sensitivity DeVore and Zu loudspeakers, he mostly used it with a variety of headphones. The Z10e got the best from Abyss AB-1266 Phi TC, Focal Clear, and ZMF Vérité Closed dynamic headphones and excelled with Stax SR-009S and Dan Clark Voce electrostatics. Herb found it wasn't powerful enough to drive the demanding HiFiMan Susvaras, but then it was upgraded to deliver the full 10Wpc to headphones. After the update, it reproduced low frequencies that were "delectably large." HR summed up the revised amplifier by saying, "The LTA Z10e/Susvara combo missed no beats, showed no weaknesses, and kept my head bopping. . . . The Z10e amp displayed no hesitations, dullness, or clipping; no smoke from the tires, no engine stalling—only full-traction, high-torque engagement." With the Audeze CRBN headphones, the Z10e's "overall timbre and tone were just right and satisfyingly color-saturated." Compared with the Feliks Envy using HiFiMan's easy-to-drive, closed-back R10P planar magnetics, HR noted that the Z10e sounded slightly warmer with a slightly less-sharp focus. (Vol.43 No.5, Vol.44 No.2, Vol.45 Nos.1 & 3, Vol.47 No.2 WWW) Meze Audio 109 Pro: $799
HR found that these elegant-looking dynamic headphones deliver a major portion of the Romanian company's flagship Elite's "seductive resolve." Source impedance is 40 ohms, and the drivers use a 50mm beryllium-coated polymer, cellulose/carbon-fiber composite and copper-zinc alloy diaphragm. With every amplifier he tried, HR wrote that the 109 "exhibited a perfect right-brain/left-brain balance; beautiful sound and musical insight were celebrated equally." Playing The Barbra Streisand Album, from 1963, HR noted that the 109s powered by the Feliks Envy amplifier "conveyed every eager breath of Streisand's fresh-faced exuberance." With ARCAM's A25 integrated amplifier, he summed up the 109s as "exquisitely balanced tone-wise." (Vol.47 No.4 WWW)
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The "Headphone Edition" of Naim's Uniti Atom streaming D/A integrated amplifier, the Atom HE features both single-ended and balanced headphone outputs as well as a preamplifier output. Inputs include a single unbalanced analog on RCA and digital—two TosLink S/PDIF, one coaxial S/PDIF, USB, Ethernet, and Bluetooth (aptX). Control is via buttons next to the front-panel display, Naim's iOS and Android apps, or with Roon. Used as a D/A preamplifier, the Atom impressed HR: It reproduced the body and reverberant character of a piano as graphically and completely as his Rogue RP-7 preamp sourced by the dCS Bartók. "That, folks, is saying a lot," he wrote. With the Atom HE powering the easy-to-drive, low-impedance (35 ohms), high-sensitivity Focal Stellia headphones, HR felt the sound was "squeaky-clean, bass-taut, and superdynamic lively." After five weeks of auditioning the Uniti Atom HE with a variety of headphones, HR concluded that its best and most obvious trait "was how gracefully and insightfully it danced through one musical genre after another. It was never not enticing. It was never not engaging. It never disappointed." However, he did caution that the Atom HE plays best with headphones with a sensitivity of 88dB/mW or higher. HR subsequently used the Uniti Atom to compare the 2020 and 2022 versions of Focal's Utopia headphones. (Vol.44 No.9, Vol.46 No.5 WWW) Sennheiser HD 650: $499.95 ★
The HD 650s are an evolution of Sennheiser's very successful HD 600 open-back dynamic headphones, claimed to provide superior results due to hand-selected parts with closer tolerances and the use of a specially developed acoustic silk for the driver diaphragms. Compared to the Grado SR325i, the Sennheisers sounded richer but slightly darker. JM found that their very effective seal created a resonant cavity that produced "bass that is both quite deep and a trifle indistinct." JA's new reference cans. Compared to the Audeze LCD-Xes, the HD650s had a similar overall sound, but lacked bass control, detail resolution, and ambience retrieval, said JA. (Vol.28 No.6, Vol.31 No.9, Vol.37 No.3 WWW) Warwick Acoustics Bravura: Silver finish $6995;
with "Black Edition" finish: $7795
This British electrostatic system includes a D/A-energizer/amplifier. The headphones use patented membrane technology that employs a thin laminated film affixed to an open, eight-cell insulating spacer made of Formex. HR described the Bravura's sound quality as "clearly stated, tight and strong of bass, and rhythmically forceful, with good body and timbre." He concluded that "The Bravura's unbypassable digital processing made it impossible for me to say anything verifiable about how Warwick Acoustics' newest electrostatic headphone system compares to any other electrostatic headphone you might be familiar with. But my diverse listening experiments lead me to conclude that, for anyone seeking a handsome, comfortable, reasonably priced, substantially built, exceptional-sounding entry into the realm of electrostatic headphones, the Bravura is a must audition." (Vol.45 No.7 WWW)
Two-chassis, 53lb headphone amplifier with XLR and RCA inputs but only balanced outputs, which doubles as a preamplifier. Standard-version tube lineup is four Psvane 300B directly heated triodes, two Russian-made 6SN7 dual triodes, and a single (Russian) 5U4G rectifier tube. Elite edition ($11,699, not reviewed) offers upgraded components. As a preamplifier, compared with HR's reference Rogue RP-7 the 3ES was "more spirited, more physical, more locomotive-rolling-forward." As a headphone amplifier—it can drive both dynamic and electrostatic headphones—HR found that with Audeze CRBNs the Woo produced sounds that "were exquisitely formed, distinctly visual, and exceptionally three-dimensional." With the Stax SR-X9000 electrostatics, the 3ES emphasized the speed and timing of the groove, though it sounded cooler and dryer than the Linear Tube Audio Z10e, with less detail. (Vol.45 Nos.1 & 3 WWW) B: Focal Bathys: $699
These closed-back headphones offer active noise cancellation and can be used with or without wires. Without wires, the Bathys uses Bluetooth 5.1; with wires, it uses USB-C. (While the USB-C connection works natively with Android devices, iOS devices need Apple's "Camera Kit" Lightning-to-USB dongle, along with a USB-C–to–USB-A adapter.) The built-in DAC supports PCM audio up to 24/192. Controls are placed on the right-hand cup; as well as power on/off and source selection, these offer three noise-cancellation choices, can summon Amazon Alexa, Google Assistant, or Apple's Siri, and even operate a hearing test, with the supplied Mimi app, to tailor the headphones' equalization for the user's hearing. In Bluetooth mode, even without EQ or Mimi, RvB found the sound of the Bathys "impactful, punchy, and convincing." He noted that detail retrieval was especially excellent on acoustic instruments and vocals, male voices sounded natural and not overly chesty, and transients were "extraordinary" for 'phones with dynamic drivers. (Vol.47 No.2 WWW) C: Apple AirPod Pro 2: $249/pair
Although the new Bluetooth 5.3 standard implemented in the Pro 2 can handle lossless streaming, Apple sticks to its own AAC codec for this noise-canceling wireless in-ear monitor. RvB commented that in terms of convenience and thoughtful touches, the AirPod Pro 2 made the ownership experience second to none—"awe-inspiring, in fact." An interactive ear test lets you tailor the Pro 2's sound to your ears and compensate for hearing deficiencies. Additionally, you can engage Personalized Spatial Audio after using your iPhone's TrueDepth camera to measure your face and each ear, yielding a unique earprint. Although the full noise-canceling mode is best for use in noisy surroundings, RVB preferred the Transparency mode, which lets in a small portion of the room's environmental sound. "Overall, I found the music a bit more spacious with Transparency turned on, " he wrote. He concluded that while he had mixed feeling about the spatial audio surround-sound performance—it worked well with Atmos-encoded movie soundtracks but he found it mildly annoying with some music—he admired the AirPod Pro 2 for how well-thought-out it was, and loved how cleverly the pair was integrated with Apple iOS devices. (Vol.46 No.3 WWW)
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Audeze CRBN, replaced. JPS Labs Abyss Diana TC, discontinued. Questyle Audio M12, discontinued. AudioQuest DragonFly Cobalt, JA hasn't used it "in a couple of years". ampsandsound Bigger Ben, Focal Clear Mg, Pass Labs HPA-1, not auditioned in a long time.
