I guess they're terminated imprperly or there should be somewhere loose ground connection. AQ RCAs are detachable so you can easily spot the case...
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I suspect bad interconnect are at the root of the cause...
Seriously, have you pulled the connectors apart to see if you've got a lousy / broken solder joint or something obvious in there? I assume since you're asking here they're not new ICs or you would have just returned them.
You didn't loosen up a jack or two swapping them in/out, did you?
What are your old ICs and what other stuff do you have? Tube preamp???
Does this happen with both left and right speakers. Big question. If it only happens to one speaker, try reversing and see if the problem follows. i recently bought a pair os custom interconnects from someone well-regarded on audiogon and he shipped me a replacement for the one bad cable by express mail. If it happens on both of them...well did someone really skrew up on the soldering? You can also try them on a friend's system. Just, BE CAREFUL!