• would taking an optical out to a battery powered dac make a diff?

  • Yes, thats a much better idea. Good thinking fella. Feed output of DAC into a line level i/p on the amp. You might need to tweak the audio output settings menu on the iMac to make it see the opt out, I'm not familiar enough with hipster pooters (ducks for cover!) to talk you through that one.

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