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Replace the plug, they most likely had a ground loop where it was plugged in and cut the common to get rid of noise. Replacement ends are easy to find at Home Depot, Lowes, ACE, etc. Try that first, if you still have an issue, post a comment and I can help you further. Hope this helps
check the cable 1st. If this speaker is powered, you could have a bad shield, or the power is causing a ground loop.
If the speaker is coming from an amp using speaker wire ie: 2 lead + - check the connection and make sure no fraid strands are touching each other on the rear connection.
In addition check your TV, Ap, And speaker system (if sub is powered independently) are all on the same curcuit.
a certain cause for ground looping resulting in hum.
There is actually some good news. I had this problem with my PB10s (1 have 2 PB10s and 2 PB12s) It is one of 2 things, the first is that it could be a capacitor and resister combination on the amplifier board (which was the fix for our PB10 with the same problem), or 2nd, the AMP IC, which is not available for the PB12. hmmm
Hello, Jesse. I doubt I can help, but there is at least one SIMPLE thing you can try - with maybe a 10% chance it wil return your unit to normal:
Unplug the unit for 30 seconds, then plug it back in to a DIFFERENT outlet.
Oh, yes - there are NO fuses or other "reset" devices.
I'm sorry I couldn't offer you more help.