Music in the Round

I'm sure that the larger manufacturers were displaying new audio/video receivers and preamplifier-processors at the Las Vegas Convention Center last January, during the 2014 Consumer Electronics Show—but except for dinner, I didn't get out of the Mirage, where I slept, or the Venetian Tower Suites, where the high-end audio displays were concentrated. Still, there were new developments to report; see Stereophile's almost live on-line coverage.

Power amplifiers are unglamorous but essential. In theory, they have only one task. But, according to audio sage Yogi Berra, "in theory, theory and practice are the same. In practice, they are not." Amplifiers must take a voltage input signal and provide an output of somewhat higher voltage but of substantially higher current, the product of which is power. The task is complex in that this output must be applied to electrical interfaces whose characteristics vary widely from speaker to speaker—across the audioband and, for some, even at different power levels. There are no control mechanisms or feedback signals to help. The power amp must just stand and deliver.

My experience at last May's Home Entertainment 2004 East confirmed that even a big cheerleader for discrete, high-resolution multichannel music must be realistic about the vast heritage of two-channel recordings, which will dominate collections for years to come. Although we can enjoy these recordings with a good stereo system, a multichannel system can offer options that give them new life without superimposing false and disturbing directional effects or smearing the two channels around and behind the listener.

It seems that the rising popularity of downloading of music files is going to affect not only the distribution of high-resolution recordings but also the availability of multichannel recordings. Once freed from the technical, marketing, and distribution constraints of physical media, large hi-rez and/or multichannel files can more easily be made available. The established providers of music downloads, such as Acoustic Sounds, HDtracks, and iTrax in the US, are being joined by: sites that specialize in particular genres of music, such as the Classical Shop (UK); other sites, that focus on particular formats, such as Native DSD Music (Netherlands) and the Promates Music Store (DXD files, Denmark); and music producers, such as Blue Coast Music and the Boston Symphony Orchestra (BSO.org), that offer their work directly to listeners.

Most new preamplifier-processors now fall into one of two categories. First are the fully featured models, with ever-growing numbers of channels to support such immersive surround-sound formats as Dolby Atmos, Aureo3D, and DTS-X. An example is Marantz's 13.2-channel AV-8802, which replaces the 11.2-channel AV-8801—a sample of which I've owned for barely a year and use only in 5.2! The second category is that of such high-end models as Classé's Sigma and NAD's M17, which offer only 7.1 or 7.2 channels, and from which nonessential features have been trimmed in favor of audiophile-grade circuit components and construction. But if money is no object, there is a third class of pre-pro, exemplified by Trinnov's Altitude³² and Datasat's RS20i, in which no compromise is made in any of these parameters.

Outside of the listening I do for this column, I always audition, assess, and review components without using any equalization or room correction—primarily because I assume that most Stereophile readers listen in two-channel stereo, and that most aren't all that interested in EQ. Besides, two-channel is the tradition I come from, and my first instinct is to try to get at the essence of the individual component itself, without applying extraneous tools or accessories. John Atkinson's bench tests are based on the same philosophy.

With the atomization of the playback of digital files into storage, servers, streamers, format converters, and DACs, I find that I've accumulated many miniature power supplies: small pods and wall warts. Most of these are generic switching devices made by companies other than the manufacturers of the components they power, and even those not designed for audio systems are, of necessity, at least adequate for the task. Because many of these supplies are indistinguishable from each other, I've taken to labeling them with sticky notes to remind me which goes with which component. Nonetheless, I'm concerned that they're no more than the commodity power modules available for a few bucks each on eBay. Whenever I think of the four or five of them clustered behind my equipment rack, I begin to suspect them of plotting revolt against the fancy gear they serve.