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How 2 hook up a active subwoofer to a receiver or integrated amp with no subwoofer pre out on unit - YouTube
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Using RCA pre-out for amplifier ( for subwoofer ) or Subwoofer line out with x-over | DIYMobileAudio.com Car Stereo Forum
Can you connect a subwoofer to an amplifier's high level input using an RCA cable (balanced) instead of using speaker wires? - Quora
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