Subvoofer burns fuses and dosen`t work

If there is a subwoofer with an end-amplifier inside there could be a capacitor problem by deformed or leaking capacitors but also look at the heatsink where are often mosfets placed or vintage conventional NPN / PNP transistors and they are in most times short -circuited between GDS gate drain source if its a mosfet or between base collector emitter if there is a transistor is used maybe when an active transistor output stage is used is it also handy to make a little test bank , to make a serial connection from mains over a 200 watt lamp. this in order to save fuses.

Beware ! The accu is example for mains 120V and the meter for the subwooferamp powercable (not for the speakercable) its only an example for a connexion diagram how to spare the fuses in a test mode. if there is a fuse placed