I’ve had my SDS200 for a two weeks now and have a couple of questions about the Audio Off Time setting. My SDS200 has a very slight constant hum, but if I hadn’t read the posts on the hum issue I would have just thought it was normal. (I can’t hear it at all from 2-1/2 feet away.) However, now that I am aware of the issue it is annoying me, so I set the Audio Off Time at 500 ms. But now I am wondering how many people use the the Audio Off Time setting and if there is a downside to having the amplifier constantly turn on and off.