Digital Processor Reviews

As readers of the Stereophile eNewsletter will be aware, the twin subjects of distributing music around my home and integrating my iTunes library of recordings into my high-end system have occupied much of my attention the past year. I bought an inexpensive Mac mini to use as a music server, using an Airport">http://www.stereophile.com/digitalprocessors/505apple">Airport Express as a WiFi hub, which worked quite well, but my big step forward was getting a Squeezebox. I described this slim device in the mid-Marchhttp://www.stereophile.com/images/newsletter/306Bstph.html">mid-March; and mid-Aprilhttp://www.stereophile.com/images/newsletter/406Bstph.html">mid-April; eNewsletters; I urge readers to read those reports to get the full background on this impressive device. In addition, the forums and Wiki pages on the Slim">http://www.slimdevices.com/dev_overview.html">Slim Devices website offer a wealth of information on getting the most from a Squeezebox.

Looking at all of the high-end headphones and headphone accessories available today, it's difficult to even remember how barren the head-fi landscape was in the early 1990s. Back then, headphones got no respect, except for exotic, expensive electrostatic models, yet most of the world listened to music through headphones all the time, mostly through crappy cans connected to portable players. (Well, maybe it wasn't that different a landscape.)

In his bimonthly column, "The Fifth Element," John Marks has tried to identify pro-audio components that would be of interest to audiophiles. In his June 2005 episode, John wrote about Grace Design's m902 D/A headphone amplifier ($1695), the Colorado company's replacement for the 901, which had long been a favorite of his. Changes include: the handling of single-wire sample rates of up to 192kHz; unbalanced analog outputs, controlled by the front volume control, to allow the unit to be used as a preamplifier; a cross-feed processing circuit licensed from www.meier-audio.de; power-supply revisions; and the provision of a USB digital input, in addition to S/PDIF, AES/EBU, and TosLink.

Usually, a Stereophile "Follow-Up" follows up (duh!) a full review of the component in question. This review, however, is intended to flesh out a cryptic comment made by Wes Phillips in April's "As">http://www.stereophile.com/asweseeit/405awsi">As We See It": "When Apple introduced its AirPort Express wireless multimedia link," Wes wrote, "it even included a digital port so that an audiophile—such as Stereophile's editor—could network his system, using the AE to feed his Mark">http://www.stereophile.com/digitalsourcereviews/159">Mark Levinson No.30.6 outboard D/A converter. 'Sounds okay,' deadpans JA."

Five years after the launchhttp://www.stereophile.com/asweseeit/164">launch; of the audiophile's dream medium, Super Audio CD, the format remains stalled in the market.

The X-DAC v3 replaces Musical Fidelity's Tri-Vista 21 DAC, which is no longer in production, although you might find some on dealer's shelves. The Tri-Vista 21 used two pairs of subminiature 5703 WB military tubes in the analog output stage. MF's Antony Michaelson called this Cold War tube, which is no longer made, a trivistor. The Tri-Vista 21 was last seen selling for $2395.

Sony Classical's head of engineering, David Smith, is a man whose opinions on sound quality I have come to respect. So when David e-mailed me a year or so back, enthusing over a new DAC he'd heard, I paid attention. When Lavry Engineering contacted me about reviewing their DA2002, I didn't need much persuading.