[RileyD]

I am considering the new Audio-gd DI.  I would put the DI between my Sonos ZP90 and Rega DAC as a means of reducing jitter in the digital out on the Sonos.

Two questions:
First, is anyone using the Audio-gd DI with a Sonos, and what is the result?
Second, help me understand the difference between the two models offered.  From the best I can tell, the DI-DSP has a second chip for additional processing and offers upsampling - but I am still not clear about this.

Any advice is appreciated.  Here is what the Audio-gd site says ...

"What's different between DSP1 and DSP-3.1:
                    Both DSP1 and DSP-3.1 are based on the Altera Cyclone II chip, but we apply different software to perform different functions. Both have data synchronization to reduce jitter.
                    DSP1 has a built-in high performance digital filter, it is only used for DAC.
                    The DSP-3.1 is especially designed for DI only, not designed especially for DAC. It has built-in upsampling which allows output up to 96KHz or 192KHz (In default setting, its output is the original sampling), and designed for high speed SPDIF output, without digital filter."

http://www.audio-gd.com/Pro/dac/DIv2/DIv2EN.htm 

[twosheltons]

You are on the right track with reducing Sonos jitter.  I went for Wired4Sound modification to Sonos and it made a huge difference with my Rega Dac/Naim Integrated system.  The local Naim dealer was a skeptic who thought a good $3000 Dac would clean up the jitter.  But after borrowing my unit for two days, he's a believer.  As other solutions, you might want to consider Empirical Audio's Syncromesh re-clocker ($600), which was favorably reviewed by John Darko at 6 Moons.    I think he liked it a bit better than the less expensive Audio GD device.  Good luck.  http://www.6moons.com/audioreviews/empirical4/1.html