I'm using "Audirvana Plus 3" on my iMac because I want to listen to DSD when available. Unfortunately, when using the toslink line, DSD ISO files will not play through the DAC. An USB connection will play DSD ISO files. Apple Lossless files have no problems over toslink. This must be my imagination but the toslink line does not sound as good as the USB line with Apple Lossless files. Toslink gives more of the "sound in a paper cup" impression.
