It could well be a function of switch-on thump or warmup current flow from the Mac. I would switch on the Mac first, allow it to stabilise for say 5 minutes, then power up the AR - there should be no problems that I can see. Set levels low and operate all the switches on the Mac. If you get any huge pops, either exercise care in future or get the relevant switches suppressed with audiophile grade caps and resistors.
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