When Using ADAT with Digidesign Interface (Fix pops & clicks)

Hello, If by ADAT you mean optical cable then the answer is yes. Digital optical cables support up to Dolby 5.1 surround. Thanks, FJD

Its probably a faulty 1394 port. Musicans Custom Electronics in Chicago can fix it. (708) 755 6960

firewire ports fried need to replace mine did same thing

You have to goto motu audio/midi setup an config the optical output to adat and make sure you set the sample rate to 48000 and check your setting in audio/midi setup in your system preference under mac this should solve the problem.

The STAC9221 is deigned for media-centric systems such as Media Center PCs, Game Enthusiast PCs, and new classes of devices aimed to distribute music and video around the home. The STAC9221 sets the standard for high performance by providing 8-channels of true 24-bit audio with a 105dB SNRSee signal-to-noise ratio.
..... Click the link for more information. (Signal-to-Noise Ratio). This level of performance enables theater quality 7.1 surround sound to PCs and PC-like devices that continue to move into the living room alongside or in place of traditional consumer electronics gear. The STAC9221 incorporates an ADAT(R) Lightpipe interface allowing connectivity to professional audio equipment. The STAC9220 provides 95dB SNR performance setting the standard for the high volume, mainstream desktop PC and high end notebook PCs

Hope that helps.
For more see;
http://www.thefreelibrary.com/SigmaTel+Announces+the+STAC9220+and+STAC9221+8-Channel+High...-a0126662778