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Powered Subwoofer Cable
Amazon.com: Mediabridge ULTRA Series Subwoofer Cable (15 Feet) - Dual Shielded with Gold Plated RCA to RCA Connectors - Black : Electronics
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DIY SPEAKON CABLE FOR ACTIVE SUBWOOFER
SpeakOn-to-Banana subwoofer cable for DIY Subwoofer (still WIP, so that's for another day) : r/DIYAudioCables