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Head Unit Only Has 1 RCA Subwoofer Output - 2 Effective Ways
Using RCA pre-out for amplifier ( for subwoofer ) or Subwoofer line out with x-over | DIYMobileAudio.com Car Stereo Forum
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How to Connect Two or More Subwoofers in a Home Theater Setup
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How to Connect a Subwoofer to a Receiver or Amplifier
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How To Connect A Subwoofer To A Receiver Without Subwoofer Outputs - Sound Certified