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Best RCA Y-adapter cable 2 female to 1 male for Polk Audio PSW10 10″ Powered Subwoofer – Official Website
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DHIVIS RCA Audio Interconnect Cable, for Subwoofer, Power Amplifier to AVR, Reference Coaxial RCA to RCA Cable (2 Meter/Single) - JioMart
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Amazon.com: Cable Matters Braided 2-Pack Shielded Subwoofer Cable 6 ft, RCA Cable/Digital Coaxial Cable (Digital Audio Coaxial Cable and LFE Subwoofer Cable) - 1.8m / 6 Feet : Electronics
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