My first sub was the ep350, which went into standby mode while not in use. Then I upgraded to the 500, which has no standby. Spoke to the nice folks at Axiom who said leaving it on will pose no problems. That was almost a year ago and I have not had any problems. They did say the 500 consumes almost no power while idle. Having said that, I wonder how much powe the 350 would have consumed had it not gone into standy mode?

You should be fine

Axiom stuff, Denon stuff, & Sony stuff