Thanks a bunch!
Will run thru the list, let you know the results but I'm confident it's not a grounding issue 'cause both the 4x75 amp and the Kenwood are grounded to the same post the battery is grounded to... and turning off the Kenwood has no effect on the 'whine'.
I'm not sure about where the stinger is grounded though... and I suspect you're right in that the stinger's output is set too high. Will try to lower its output and raise the amp's to better match.
Also, you say stinger is low-qual; who makes a good one?
Cheers!
Gringo
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