200$ subwoofer project [NEED PARTS]

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Find a broken power amp cheap and repair it. Become friendly with insane musicians and maybe one of them will sell you a used amp of dubious provenance cheap.

Consider a horn-loaded sub since higher sensitivity has numerous benefits. Or go bandpass and tune it for a loud kick drum.

Obtain one good amp OR build one good sub, and rent what you don't have.
 
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