I found a guy local to me selling some energy rc-30's. The only issue is he says the volume from time to time will go low for a bit and then back to the normal volume is was at. He doesn't know if the problem is from the speakers, the wiring or his receiver.
I am no speaker expert but I am guessing it is more likely a receiver issue as opposed to a speaker one. Maybe someone more knowledgeable can shed some light?