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I have looked at some KRK speakers, not too impressive in the electronic department. The fact that the volume control has no effect indicates that the cable is merely acting as an antenna conducting r.f. into the cabinet, and the amplifier is doing all the detecting and amplifying. None of their amplifiers are sheilded. Possible fixes include sheilding the cabinet using copper or aluminium foil, and then filtering on the input connector to short the r.f. to ground. have you tried two things: 1/ a 10k:10k transformer such as a Jensen just before the monitor, with caps to ground on the input XLR? Also wrap the cable through an interference blocking toroid or similar core before the caps. Use foil sheild Belden rather than wire sheild, better r.f. rejection.
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