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Editor's Note: Apart from the Bespoke, CAT, Placette, and Shindo, all the Class A preamplifiers offer balanced inputs and outputs. And unless noted, the preamplifiers listed do not have phono stages.

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Audio Research REF6: $15,000
Replacing Audio Research's Reference 5 SE of 2011, the Reference 6 is a product in which everything—parts, circuitry, the whole megillah—has been revised, the upgrades including a heftier mains transformer, an improved volume-control circuit, and new custom-made capacitors. The audio circuits include three 6H30 dual…

Editor's Note: Because of the disparity between typical tube and solid-state "sounds," we have split Class A for separate power amplifiers into two subclasses. Nevertheless, even within each subclass, Class A amplifiers differ sufficiently in character that each will shine in an appropriate system. Careful auditioning with your own loudspeakers is therefore essential. Except where stated, output powers are not the specified powers but rather those we measured into an 8 ohm resistive load. All amplifiers are stereo models, except where designated.

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Anthem STR: $4499 $$$
Anthem's solid-state STR integrated amp offers 200Wpc (into 8 ohms) of class-AB power, along with seven analog inputs—one balanced, four single-ended, and two phono (one MM, one MC). It also offers a 32-bit/192kHz D/A processor with six digital inputs—four S/PDIF (two RCA, two TosLink), one AES/EBU (XLR), and one USB. A subwoofer output is provided, but, curiously, there's no headphone output. Of interest to users with problematic listening rooms is the STR's built-in Anthem Room Correction (ARC) processor: using the…

Editor's Note: Class A "Loudspeakers" are sufficiently idiosyncratic and differ enough from one another that prospective customers should read Stereophile's original reviews in their entirety for descriptions of the sounds. We have therefore just listed every system or combination that at least one of Stereophile's reviewers feels, as a result of his or her experience, approaches the current state of the art in loudspeaker design. (Note that, to be eligible for inclusion in Class A, the system must be full-range—ie, feature bass extension to 20Hz. It must also be…

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JL Audio CR-1: $3000
The CR-1 crossover has continuously variable high-and low-pass filters built around two banks of precision Linkwitz-Riley filters that can be set for 12 or 24dB/octave via. Front panel switch. Upon encountering the CR-1, LG "wondered where it had been all [his] life;" he's been using it ever since. "It's beautifully made, sonically transparent, performs a critical role in the optimal setup of subwoofers, and has ergonomic bypass and mute functions that let you immediately hear the sonic improvements of good bass management…

Editor's Note: We strongly recommend those interested in headphone listening visit our sister website, www.InnerFidelity.com, which is edited by Rafe Arnott.

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Audeze LCD-4: $3995
For their new LCD-4 headphones, Audeze uses a variation on their tried-and-true planar-magnetic technology, with a vanishingly thin diaphragm of aluminized film suspended between a push-pull array of Double Fluxor magnets (flux density: 1.5 teslas) and impedance-matching Fazor waveguides on the outer surfaces of the earcups. The supplied cable has left…

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DaySequerra FM Reference Signature Modification: $3200 (+ cost of tuner) ★
David Day's Signature Mod effectively addresses this ultimate FM tuner's cathode-ray tube's tendency to burn out. Switching circuitry has been added to allow the CRT to turn off when not needed. The Signature Mod also replaces the tuner's incandescent bulbs with longer-lasting LEDs, and uses hand-matched, low-group-delay filters for lower distortion and better channel separation. LG noted punchy, quick bass response, a deeper soundstage, and a more transparent midrange. "The new CRT's…

AC Nexus Advanced Power Distribution & Ground Enhancement System: $20,000
Steve McCormack, once the proprietor of The Mod Squad, is the man who introduced the concept of accessory isolation feet—his Tiptoes were aluminum cones with flat tops and sharply pointed feet. Now he's brought to market this passive AC-power filter, whose Panzerholz enclosure contains two fist-sized silver-conductor capacitors from Duelund. The IEC AC inlet is a Bocchino Audio Marriner10 and the AC outlets are four Furutech Nano Crystal Formula duplexes. Four Cardas ground posts of…

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Dirac Live room correction system: Full version: €650, Stereo version: €389
Of course, the sound quality is dependent on the hardware in the system, says KR, but the acoustic transformation capabilities of DLRC are well beyond what is built into most processors. (Vol.37 No.5 WWW)

Paradigm PBK: $99
An adaption of the formidable Anthem Room Correction system used in Anthem's Statement D2 processor, the PBK includes USB cables and a microphone, and will work with up to four Paradigm subwoofers. While easier to use and considerably less expensive…

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