MikeyB,
I have also heard that hum you are talking about. I noticed it is loudest when the sub is in the Auto Off mode. Ian, I highly doubt it is due to the RCA connector I have. I have a very high quality cable, and it does this hum if my received is off, and if there is neither Line Level nor High Level plugged into it. The hum, however, seems to disappear when there is a signal going into it, or when it is not in Auto Off mode. I read a review of the EP125 (the sub I have) in an online magazine once, and they said they also heard the same hum.
