In the system I have in my office, I have an older Velodyne sub (I believe it's a CHT-10), connected to an Onkyo TX-SR700. The sub is set to come on automatically when a signal is detected. It's hooked up from the subwoofer "out" on the receiver. However, it usually doesn't come on right away.

Usually when I'm playing music, I have to turn the sub's power off. Then I have to wait at least ten seconds, then turn it back on. Usually then the sub comes on right away after this. It still sounds and works well otherwise.

Any ideas what would be causing this? It's just sort of an annoyance more than anything.