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Do your google on inexpensive Polk sub amps.
Spolier: They're junk.
My solution:
Convert sub to a passive sub box by opening it up and wiring the speaker direct to a couple of the binding posts.
But a cheap mono amp designed for use w subs (Amazon $80 and up). I bought Fosi Audio MO-3.
You may need some adapters to hook up to the amp's RCA inputs.
All good for now, let's see how long the little amp runs.
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Milwaukee, WI