Here is a picture of my Black Chameleon with Nugent's direct I2S connection. (Notice the complete elimination of the main circuit board.)
There are more mods to be done yet already my Black Chameleon is the best sounding DAC I have ever heard in my system. My friend Jon from Columbus, OH came out for a few days and he is a dyed blue analog man. We listened to digital one night and LP's the next night. He had to admit on the 3rd night that the digital indeed outperforms my analog. This would be the first time I too would make that claim.
It's hard to describe exactly how direct I2S from the Pace Car USB improves the sound. While my analog still has a bit more density to the soundstage, with my new digital rig you're completely immersed inside the 3D ambient field of the recording. I suspect the harmonic tails and reflections that are normally obscured by jitter (or distortion in the analog domain) remain intact and bounce around the room presenting a closer to live experience. In the past my analog rig did a better job at capturing "the live" ... but not anymore!
The USB input to the Pace Car is an OEM version of the M2Tech device with I2S output and no clocks on board, instead it uses the Pace Car's dual FIFO clocks. In my case 22mHz & 49mHz Audiocom Super Clock 4's. I asked Nugent about adding this OEM device with "onboard" clocks inside the Chameleon and he said the issue is the M2Tech only outputs 3.3 Volts, the DAC chips inside the Chameleon are looking for 5 Volts for optimum sound. (Steve modded my Pace Car for 5 Volt output.) Perhaps there is a way to get a 5 Volt I2S bus out of the OEM M2Tech device but Nugent is not interested in building it. Maybe this guy could pull it off???
https://sites.google.com/site/hifacemods/
If the OEM M2Tech I2S card could be modded for 5 volt output I have no doubt this would offer the "lowest cost" option for eliminating interface jitter on the Chameleon or Valab. But remember with just a USB input now we're talkin' computer audio only. Of coarse if you have the cash the Pace Car USB would still be the superior choice.
I sent the information about the OEM M2Tech board to Michael in the past but once again its a demand vs price point thing. However given the superiority of direct I2S input and looking at the simplicity in the pictures above ... there is a strong argument for a M2Tech I2S/USB input only version of the Chameleon.
More Pictures of the Black Chameleon I2S.
http://picasaweb.google.com/baulsaud...Gt5LCwjuj42QE#