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Not a new recording, and one that has already received raves in all the other audiophile publications, but if Stereophile is the only such magazine you read, you'd just better know about it, for this is the definitive symphonic recording to date.

Buy it, listen to it, and get a good idea of what the other record companies have been doing to the sound of live music. The…

From the point of view of MQA Ltd., what might success look like?

"Success" would be achieved when MQA is used to master most, if not all, new releases and back…

Each listing-in alphabetical order within classes-is followed by a brief description of the product's sonic characteristics and a code indicating the Stereophile Volume and Issue in which that product's report appeared. Thus the May 2017 issue is indicated as "Vol.40 No.5."

Some products listed have not yet been reported on; these are…

The classes each cover a wide range of performance. Carefully read our descriptions here, the original reviews, and (heaven forbid) reviews in other magazines to put together a short list of components to choose from. Evaluate your room, your source material and front-end(s), your speakers, and your tastes. With luck, you may come up with a selection to audition at your favorite dealer(s). "Recommended Components" will not tell you what to buy any more than Consumer Reports would presume to tell you whom to marry!

Class A
Best attainable…

A+

TechDAS Air Force One: $105,000 plus tonearm ★
"A visually stunning technological tour de force," the 174-lb Air Force One has a three-layer chassis of damped aluminum, a forge-processed stainless-steel platter, and a massive AC synchronous motor controlled by an outboard dual-50W amplifier. The platter uses an air bearing; LPs are held to the platter with vacuum suction. The review sample was equipped with a Graham Engineering Phantom II Supreme tonearm. Though it didn't sound as smooth as the Continuum Caliburn or the Onedof One Degree of Freedom, the Air…

Editor's Note: SACD and DVD-A player ratings are based on how they sound with their respective hi-rez media, not CD.

A+

Antipodes DX Reference: $6950–$15,530
What could tempt the frugal JA into forsaking his computer-based file-playing system for a high-quality dedicated music server? The latter must offer sound quality with which the former does not compete—and that's precisely what he found in the Kiwi-built Antipodes DX Reference. The DX Reference, which runs on the Linux operating system, runs…

Editor's Note: The sound of any particular CD transport/digital processor combination will be dependent on the datalink used-see "Bits is Bits?" by Christopher Dunn and Malcolm Omar Hawksford, Stereophile, March 1996, Vol. 19 No.3 (WWW). Unless mentioned, processors are limited to 32/44.1/48kHz sample rates. To be included in Class A+, a digital processor must be capable of handling DSD or 24/96 LPCM data.

We strongly recommend those interested in using a computer as a true high-end digital audio source visit our sister website www.AudioStream.com, which is…

A+

Merging Technologies NADAC Multichannel-8: $11,500
Among pro-audio companies that have set their sights on the domestic market, the Swiss manufacturer Merging Technologies is noted for its experience with high-resolution networked-audio interfaces. Their NADAC Multichannel-8 (its first name stands for Network Attached Digital to Analogue Converter) is intended for use with network-based file players, and is compatible with the audio-specific Ravenna protocol. Via Ethernet, the Multichannel-8 supports…

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

A

Audio Research REF6: $14,000
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-triode tubes per…

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.

A (Solid-State…