Purchased a polk audio psw250 powered home subwoofer(used).The owner stated that It would not power on,so I figured It was a fuse.Got It home and took the amp off the box and sure enough the fuse was blown.Went to radio shack and purchased the same size fuse(1 amp 250v)In both the fast blow and the slow blow type and each time I plug It In It blows each type.The sub Is In really great shape and would like to fix It but I figure This Is more trouble then Its worth.Can anybody change my mind here?

You will have to remove the plate amp and look on the pcb, it is generally located near where the main power lines come in.
If you still can' find it contact Polk tech support, Ive owned several Polk products and always found there tech support very helpful; very helpful;
Tech/Product Support
9AM-5:30PM EST Mon-Fri
1-800-377-POLK (7655) Option 1
FAX: (410) 764-5470
[email protected]
International: +1-410-358-3600

download with model number suport e-manual pdf

call parts express tell them your problem and they do have a plate amplifier that will work actually it's a better amp with more power.

The Left Line in, usually or get an RCA Y-cable adapter and share it between the two inputs.

Humming noise on your sound is not due to your speaker but it is come from the amplifier. I've encountered a lot of this problem that is caused by the electrolytic capacitor. If you are a technician first locate for a dry joints on the board and then resolder it using your soldering iron and a high quality soldering lead. Resolder not only the capacitor but also around the output I.C.
If nothing happen then it is coming from your output I.C. sometimes it was leaky/shorted which produces a humming noise but first do the the above mentioned instructions before isolating the defective output i.c.

your sub woofer is partly shorted check the output transistor of your sub woofer before pluging to the receiver or this will damage your receiver

Could be the power supply but the transformer may
have opened up due to a "surge". Might have to contact Polk to see whats up and/or dealer as the
amp may need sent in for repair!

I should just replace the parts that were burning, it will cost a lot less.

Hi, Just call the parts line at Polk Audio. They should have the fuse. You can also ask for technical if you're not sure of the problem. Here's the number for Polk: 800-377-7655 Good luck to you.

The power supply or amplifier has a shorted component.