PSW202 subwoofer blowing amp fuse

tvr2500m
tvr2500m Posts: 3
edited June 2014 in Troubleshooting
A friend has a PSW 202 subwoofer that stopped working. I removed the plate amp to look at the fuse, and the fuse was blown. Replacing the fuse, it just blew again. This was with the power switch on the amplifier turn on OR off. ???

I did call Polk support and they recommended sending it to their service center in Vista, CA.

Anyone have any ideas why the fuse continues to blow even with the power switch switched off?

Thanks!