Digital Processor Reviews

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CH Precision I1 Universal integrated amplifier
Digital Processor Reviews, Integrated Amp Reviews, Media Server Reviews
Jason Victor Serinus  |  Jan 31, 2019  |  39 comments
"The sound was to die for," I wrote shortly before my resurrection. I was taking notes about the sound of CH Precision's D1 SACD and CD Drive (now $38,000) and C1 D/A Controller (base price $32,000), in the demo room of Michael Woods's Elite Audio Systems, at the California Audio Show, just three months after the 2015 edition of the Munich High End show. CH Precision's L1 dual-mono, solid-state preamplifier (now $58,000), M1 dual-mono power amp ($104,000), and X1 external power supply ($17,000) had helped deliver "fantastic sound."
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iFi Audio Pro iDSD D/A processor/headphone amplifier
Digital Processor Reviews
Herb Reichert  |  Jan 03, 2019  |  50 comments
On the first page of the owner's manual for iFi Audio's Pro iDSD tubed/solid-state multibit DAC and headphone amplifier, the British company unabashedly describes it as "a 'state of the art' reference digital to analog converter" and "a wireless hi-res network player or the central DAC in an expensive high-end home system." As if in an afterthought, it continues: "The on-board balanced headphone section means high-end headphones can also be directly connected to it." The manual doesn't describe the headphone "section" as "state of the art," so I'm deducing that the Pro iDSD is really more a fancy-pants DAC than a high-tone headphone amp.
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Chord Electronics Qutest D/A processor
Digital Processor Reviews
John Atkinson  |  Dec 27, 2018  |  46 comments
Back in the mid-1990s, I believed that the design of D/A processors was fundamentally a solved problem. The resistor-ladder, multi-bit DAC chips of the 1980s, with their linearity errors, had been replaced by sigma-delta types that had minimal linearity error down to the lowest signal levels. All that remained for the designers of PCM D/A chips was to increase resolution and dynamic range to the theoretical limits, and to improve the mathematical precision of oversampling digital filters to match the performance of the 20- and 24-bit recordings that had just begun to be released.
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Mytek Liberty D/A processor
Digital Processor Reviews
Art Dudley  |  Oct 25, 2018  |  18 comments
I've never aspired to owning a BMW 7-series, or a Martin D-45, or a Rolex Submariner: BMW's far less expensive 3-series models capture my imagination by bordering on the affordable, likewise Martin's D-18—and as long as I live, I'll never understand the appeal of expensive wristwatches. Bling's not my thing.

True to form, when I visited the Mytek display at High End 2018, in Munich, my attention was drawn to the brand-new Mytek Liberty DAC and its three-figure price: for $995, one could now own the equivalent of the original Mytek Brooklyn D/A processor, without that model's phono preamp—this according to the company's Adam Bielewicz, who served as my product-line guide on that sunny May day.

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Music in the Round #93: miniDSP & Ripping SACDs
Digital Processor Reviews, Music in the Round
Kalman Rubinson  |  Sep 06, 2018  |  12 comments
As I took my valedictory lap around High End, the immense audio show held each May in Munich, Germany, it was clear that this year's event was an exuberant flowering of mature technology. I witnessed the dominance of hardware for LP playback, as well as analog amplifiers, many of them based on tubes, and passive loudspeakers with traditional cone-and-dome drive-units. And there was no shortage of excellent and impressive musical demonstrations. Still, I experienced no revelations, and heard no announcements of any new technology that might trigger a hopeful anticipation of the near future. It was as if HE2018 were reflecting on the past with reverence and commitment, rather than striving toward the future with innovation and adventure.
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BorderPatrol Digital to Analogue Converter SE
Digital Processor Reviews
Herb Reichert  |  Aug 23, 2018  |  18 comments
The trouble with a classicist he looks at the sky
He doesn't ask why, he just paints a sky—John Cale and Lou Reed, "Trouble with Classicists," from Songs for Drella

Left brain/right brain, yin/yang, male/female, Apollonian/Dionysian, classical/romantic, painterly/linear, dark/light, hard/soft, warm/cool...I use these contrasting adjectives in my reviews because I feel some confidence in their ability to convey the nature of what I experience while listening to recordings with whatever new audio box sits before me in the listening studio.

I also use: accurate (I hate that word), neutral (what's that?), colored, clean, transparent, open, musical. Sadly, I have little confidence in their ability to describe my experiences.

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Music in the Round #92: Digibit Aria Piccolo +
Digital Processor Reviews, Media Server Reviews, Music in the Round
Kalman Rubinson  |  Jun 26, 2018  |  62 comments
Lovers of high-resolution multichannel sound still don't have it easy. While the two-channel market is replete with snazzy, efficient music servers in stylish boxes, the only multichannel equivalents are Merging Technologies' Merging+Player Multichannel-8, and a handful of stereo devices that are rumored to do multichannel, though no such claims are made in print. To be candid, the latter will play multichannel tracks via USB, Ethernet, or HDMI outputs to suitable DACs (but that's another story), but because they're aimed at the two-channel market, they tend to skimp on the CPU horsepower and RAM needed to handle higher-resolution multichannel files. Even the Merging+Player Multichannel-8 ($13,500), with its Intel i3 CPU running Roon, couldn't entirely keep up with everything in my library.
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Aqua Acoustic Quality Aqua Formula xHD D/A processor
Digital Processor Reviews
Jason Victor Serinus  |  May 24, 2018  |  49 comments
At the 2018 Consumer Electronics Show, when John Atkinson and I entered the room shared by Lamm Industries, Aqua Acoustic Quality, and Kharma room, we were looking for two things: good sound, and digital products for me to review. When we spied AAQ's Formula xHD digital-to-analog converter, the possibility of evaluating a potentially excellent DAC made by someone other than the usual suspects felt like a golden opportunity.
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HoloAudio Spring "Kitsuné Tuned Edition" Level 3 D/A processor
Digital Processor Reviews
Herb Reichert  |  May 03, 2018  |  16 comments
While covering CanMania at the 2017 Capital Audiofest, I was sitting at the table of HeadAmp Audio Electronics, listening first to John McEuen singing Warren Zevon's "Excitable Boy," from McEuen's Made in Brooklyn (24-bit/192kHz AIFF, Chesky JD388/HDtracks), then to Macy Gray's Stripped (24/96 AIFF, Chesky JD389/HDtracks). I was listening through HeadAmp's extraordinary GS-X Mk.2 headphone amplifier ($2999–$3199), but midway through Gray's "I Try," I stopped, pulled the Audeze LCD-4 headphones off my head, and asked HeadAmp's head of sales and marketing, Peter James, what DAC he was using.

"Do you know the HoloAudio Spring DAC?"

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NAD Masters Series M32 DirectDigital D/A integrated amplifier
Digital Processor Reviews, Integrated Amp Reviews
John Atkinson  |  Apr 26, 2018  |  3 comments
When I asked NAD for a sample of their Masters Series M50.2 digital music player, which I reviewed in the December 2017 issue, they also sent me a Masters Series M32 DirectDigital integrated amplifier, which had also been introduced at the 2017 Consumer Electronics Show. Costing $3999, the M32 offers a continuous power output of >150W into 8 or 4 ohms. The M32 is the same size as the M50.2, and its smart-looking combination of matte black and gray-anodized aluminum panels make it look identical to the player, except for the black volume-control knob to the right of the front panel's four-color touchscreen, and the ¼" headphone jack at bottom left. It even has the same eight ventilation grilles inset in the black top panel.
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Prism Sound Callia D/A headphone amplifier
Digital Processor Reviews
John Atkinson  |  Mar 29, 2018  |  0 comments
I have long been aware of English audio company Prism Sound, both from my use at the turn of the century of their excellent PCI card–based DScope2 measurement system (footnote 1), and from some of my friends' enthusiasm for Prism's SADiE digital audio workstation. Prism Sound was founded in 1987 by two DSP engineers, Graham Boswell and Ian Dennis, who had first met when working at mixing-console manufacturer Rupert Neve, in Cambridge, England. From the beginning, Prism Sound operated exclusively in the world of professional audio, but a year or so ago I began seeing their first domestic audio product, the Callia, at audio shows.
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Bel Canto Design Black ACI 600 integrated amplifier
Digital Processor Reviews, Integrated Amp Reviews, Solid State Power Amp Reviews
Jason Victor Serinus  |  Mar 22, 2018  |  5 comments
When Michael McCormick, president of Bel Canto Design, suggested that I review their Black ACI 600 integrated amplifier, I accepted without hesitation. As wonderful as my reference system may sound, its dCS digital front end alone comprises four boxes and a web of cables complex enough to send many a spider spinning. Given the choice between connecting that front end to a pair of expensive, enormous monoblocks—with their similarly expensive AC cords and equipment racks/isolation platforms—or to a single, visually elegant, 45-lb box that costs $25,000, produces 300Wpc into 8 ohms, and requires only a single power cord and shelf, I think many an audiophile, even those with lots of money, might gravitate toward the latter.
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Music in the Round #90: Merging+Player PL8
Cable Reviews, Digital Processor Reviews, Music in the Round
Kalman Rubinson  |  Mar 01, 2018  |  5 comments
Merging Technologies' original NADAC Multichannel-8 ($11,500) is an impressive device. (NADAC is an acronym for network-attached digital-to-analog converter.) It has eight channels of high-resolution D/A conversion, and two more for its front-panel headphone jack; a cutting-edge Ravenna Ethernet input (based on the AES67 Audio over Internet Protocol, or AoIP); and, to my delight, a real volume-control knob on the front.
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AVM Ovation MP 8.2 CD player-D/A processor
CD Player/Transport Reviews, Digital Processor Reviews
Art Dudley  |  Jan 23, 2018  |  1 comments
For all its faults—complex grammar, inconsistent rules of pronunciation, burdensomely endless vocabulary—English has proven itself a commendably plastic language. This is good for audio enthusiasts, in the US and elsewhere, whose choices in playback gear continue to evolve not only in substance and function but in name: Unlike many of the people who speak it, English can keep pace with the changes.
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MBL Noble Line N31 CD player-DAC
CD Player/Transport Reviews, Digital Processor Reviews
John Atkinson  |  Jan 18, 2018  |  4 comments
MBL's Corona C15 monoblock has been one of my amplification references since I reviewed it in 2014, and as I've been reviewing DACs the past year or so, it was high time I spent time with one of the German company's digital products.

"Black shiny products are tough to photograph at shows, so trust me when I say the new N31 is dripping with gorgeousness not reflected in this photo," wrote Jon Iverson in his report from the 2017 Consumer Electronics Show. And when I unpacked my review sample of the Noble Line N31 ($15,400), I was indeed taken with its looks.

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