In my November 2013 column, I looked at the NuForce AVP-18 multichannel preamplifier-processor ($1095) and the exaSound e28 multichannel DAC ($3299), each of which offers fresh options in its category that break with the predictability of mainstream products. That predictability is the result of market analysis that supposedly tells manufacturers which features users want most. However, it's just as true that users can buy and choose among only those components and features already offered. Many of us are more peculiar in our demandswhat's generally offered doesn't always fit our needs. This month, I look at an unusual pre-pro and a multichannel digital equalizer at opposite ends of the price spectrum.
After going so far off the beaten path in my last column, with examinations of digital signal processing (DSP) from miniDSP and Illusonic and multichannel in-room measurements, this month I take a look at and listen to a new preamplifier-processor from Yamaha, along with its companion multichannel power amplifier. The Japanese company (footnote 1) was a pioneer in digital signal processing (DSP) and multichannel sound, but for a long while now has been swimming in the mainstream of audio/video receivers and home theater.
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 Showbut 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.
It seems more and more that I'm reviewing equalization products in this column, and that such components are less often dealt with in the magazine's formal equipment reports. But it's not as if the problems created by room acoustics affect only multichannel systems. Stereophile has not ignored the topicsee the many reviews of physical and electronic room-treatment products posted on this websitebut months can pass without publication of a review of such a component. Meanwhile, multichannel devotees such as I seem to talk about almost nothing elseand here's why.
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 speakeracross 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.
It's August as I write this, and I'm looking back at some things that need to be discussed, and forward to the fall audio showsparticularly the 2014 New York Audio Show, which, by the time you read this, will have been held in Brooklyn, September 2628. I grew up in Brooklyn, not in "the city," Manhattan, a place that we traveled to only for special reasons. Audio shops were rare in BrooklynI remember only Audio Exchangebut in Manhattan there was a small cluster near Grand Central Station, there was Lafayette Radio near the Holland Tunnel, a few scattered elsewhere, and the magnet of Liberty Street in lower Manhattan, where more than two city blocks were packed with audio shops.
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.
While Dolby Atmos, which adds height information to both cinema soundtracks and domestic surround-sound reproduction has created a strong buzz in the mainstream market for home-theater A/V receivers and preamplifier-processors, it's too early to know what, if any, impact it will have on music-only recordings. I'm not sanguine about the prospectsas impressive as I've found Atmos to be for movies, the expansion of sources to the vertical plane would seem to be of little value for music performed on acoustic instruments. Moreover, it seems unlikely that mainstream record labels will adopt this format any more than they have embraced multichannel or even high-resolution audio. Sound of CD quality or below still dominates the recording industry, even if hi-rez downloads are a bright but tiny point of light.
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.
I spent most of my time at the January 2015 Consumer Electronics Show exploring amps and preamps for Stereophile's on-line coverage of the show, but there were a few items of interest to fans of multichannel. There were demonstrations of Dolby Atmos, Auro3D, and dts:X, but these mostly focused on moviessave for Auro3D's thrilling demo of 2L's Magnificatan album of music by Arnesin, Gjeilo, and Kernis, with Anita Brevik conducting solo singers, chorus, and the Trondheim Soloists and recorded in a cathedral (Pure Audio Blu-ray, 2L-106-SABD). The ambience was more enveloping with Auro3D's added height dimension, compared to what I hear from 5.1 systems, but I'm not sure whether this will be enough to encourage music listeners to make the necessary investment.