I'll have to double check, but I think everything is getting its power/ground directly from the battery (my two amps for sure, though my head unit might be running to the circuit board by the driver for some reason). My other amp, which runs a sub and two in-boats, gets no noise whatsoever. I measured voltage drops across the ground and power supply--for my noisy amp, ground was .003 V and power was .015 V, which seems to indicate to me that it could be the power supply, particularly across the power distribution block.
Thanks
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