In the last week I've noticed a high-pitched whine coming from the sub...it's pretty loud and very annoying. As soon as I power off the sub it goes away and once I power it back on it seems to take a bit for it to start up (maybe 30 seconds).
Any guesses what it might be?
I have a DSW Pro400 (about 2 months old) connected to an Onkyo 705 with a 16' monster subwoofer cable. I get the noise whether or not the sub is connected to the recieiver...it just has to be powered on.