>>> I have an early EP500 and the amp plate gets warm--but not "very warm"--whether it's in standby or in full operation.

My early model 600 does this as well but I have noticed that the green light is always on regardless whether the sub is in use or not. Seems like my 350 has an orange(ish?) standby light that glows whenever the sub is in the standby mode and turns green whenever the sub is in use.

Rick
Our Room

smile