Digital Processor Reviews

Rather a mouthful, the name of this digital decoder is derived from that of the designer, Robert Wadia Moses. The "computer" part of the title relates to the custom digital filter function generated by a set of 32-bit microprocessors: for simplicity's sake, I shall abbreviate the name to "WD1000." A more expensive version, called the '2000, sells for $6995, and carries some additional features and details. The resampling rate is increased to 64x in the '2000, with the additional optical and digital input switching and the main power supplies each contained in separate additional enclosures.

Last December, when Wadia Digital announced that it was releasing an iPod docking cradle that could access the digital signal before it had passed through the player's own D/A converter, many audiopundits were surprised. I was disbelieving, and nearly told Wadia's John Schaffer that he was shining me on. After all, Apple has tiptoed around the whole issue of consumers being able to digitally copy their iTunes files, going so far as to wrap its iTunes Music Store files in digital rights management (DRM) code.

After it was delivered, I weighed the box containing Wattson Audio's DAC-equipped Madison LE Streamer on my bathroom scale. It was hardly bigger than a shoebox. It weighed 8.3lb.

When I opened the main box, I found two smaller boxes. The little brown one contained a fist-sized power supply in a chassis of extruded aluminum, with a label attached that said "AC/DC Hybrid Adaptor" next to a circle containing a sun cross symbol and the words "Designed, Engineered and Built in Switzerland" in capital letters circling its top edge. Below the circle was more writing: "Wattson Audio—a CH Precision company."

The Wattson Madison LE's 2.3lb chassis was inside a larger white box with black block letters saying "Madison." Under that, written in cursive, were the words "Lounge Edition." The L in LE is for Lounge, not Limited as you might expect.

I've reviewed a few DACs but never one this small, light, and elegantly formed.

While my enthusiasm for the long-discontinued Sony">http://www.stereophile.com/cdplayers/708play">Sony PlayStation 1 remains high (see the July 2008 Stereophile), I freely acknowledge that not every high-end audio enthusiast wants a CD player with an injection-molded chassis, a Robot Commando handset, and a remarkable lack of long-term reliability: Yes, the Sony sounds wonderful, but sound isn't everything.

One of the better digital front-ends I've ever heard was demonstrated for me a number of years ago at the house of an audiophile friend: a Weiss Engineering combo of Jason CD transport and Medea digital-to-analog converter. That front-end remains in my mind as one of the only digital systems I've heard that could compete with the very best that vinyl has to offer while still doing what digital does best. In other words, there were warmth and musicality, staggering dynamics, and real silent backgrounds. When, recently, I saw that the Swiss company had come out with a DAC featuring onboard volume control, a headphone amp, and a FireWire input, I knew I had to give it a listen.

Hi-fi system resolution has long been the cause of heated arguments. But when it comes to converting digital data to an analog signal, there can be no argument. Data go in at one end of a DAC and an analog signal comes out of the other end, with a noise floor directly rated to the combination of the converter's digital and analog resolution. Ever since I started measuring digital products for Stereophile, I have been expressing a D/A processor's effective resolution in terms of the equivalent number of bits.

When standalone digital/analog processors made an appearance a quarter-century ago, they were limited to the CD medium's 16 bits of resolution—at best. These days, almost every DAC can process at least 24 bits, and many models offer between 20 and 21 bits of real-world resolution. Modern models from Benchmark, dCS, , Merging, Mola Mola, Okto, and Weiss illustrate not just the skill of the circuit designer but also that of the engineer who laid out the printed circuit board.

One of the first digital processors I encountered that offered 21 bits of resolution was the Weiss DAC202, which Erick Lichte reviewed in January 2012. Subsequent processors from this Swiss company have consistently performed well, not just on the test bench but also in the listening room.