I currently have a 6+ year old Sony SA WM-250 "sub"woofer. It is modest but more that enough for my current hometheater needs. My problem is when I turn the sub on it begins a very loud, low, hum starting any where between 20 minutes and 1 hour after turning it on but not immediately. It will do this with and without the rca cable connected leading me to believe it is internal to the sub. I opened the back and see no signs of leaking or bulging capacitors. What else should I look for?
Just in case it matters:
Reciever: Denon AVR-591
Sub: Sony SA WM-250
Center: PSB C1
Fronts: PSB B1
Rear: PSB A/V
Just in case it matters:
Reciever: Denon AVR-591
Sub: Sony SA WM-250
Center: PSB C1
Fronts: PSB B1
Rear: PSB A/V