Not sure if this is the correct forum so please forgive me if I am wrong in posting here. I believe my issue lies somewhere in the power supply of my powered subwoofers amplifier. For a little background I have a ten inch Triad powered subwoofer that I recently acquired for the large sum of 5 dollars. The original owner stated that the subwoofer no longer played audio but had an annoying hum through the subwoofer driver. After inspecting the subwoofer I found that description to be spot on. Regardless of input no audio is produced other than that nasty hum. Unfortunately there is no model number on the sub. All I know is that it is a ten inch driver in a 13 inch square cabinet,built in 98-99,and there is a sticker on the board that says "Triad 9.1 Amplifier" . Google searches for the amp model number haven't uncovered anything useful. There is dc voltage present on the speaker leads(4-5 volts) and the rail voltages look a little odd. I have +63 volts and -40 volts on the rails. One of the large filter caps has a slight bulge to it but I am not sure if my entire issue is with the cap or if something else caused the stress on the cap and caused it to bulge. I am not new to electronics as I have repaired several car audio amplifiers but when it comes to home electronics I have very little experience. I was hoping somebody here might be able to point me in some directions or give me some advice as I'd like to get this thing booming again.