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Need to find a way to repair Pioneer SW-99 subwoofer. HELP!!!!? Answered

it has the adjustment for power supply on the back and any adjustment over 110v, I get the thump- thump error. Any ideas? Checked everything I know to check

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You sure about the model ? I can't find a reference to it. Is it a car speaker ?

That's the model. It's a home entertainment sub woofer. I haven't been able to find it either.

How about some pictures ? I'm not sure I understand the bit about "110 V" 

Try shorting the input and see if it still does it ?

it has a voltage adjustment on the back for 110v-120v-220v-240v

I wonder if its been over voltaged then ? What supply SHOULD it be on ? 

Steve