Amazon.com: Poyiccot RCA Splitter Male to Male Cable, RCA Y Splitter 1 RCA Male to 2 RCA Male Stereo Audio Subwoofer Cable, 2RCA to 1RCA Bi-Directional RCA Y Adapter Cable - 25cm/10inch :
Amazon.com: Mediabridge ULTRA Series Subwoofer Cable (15 Feet) - Dual Shielded with Gold Plated RCA to RCA Connectors - Black : Electronics
RCA (M) to 2 RCA (F) Stereo Audio Y Adapter Subwoofer Cable (24k Gold Plated) 1 Male to 2 Female Y Splitter Connectors - Walmart.com
Y-split audio cable (2x RCA female - RCA male)
Silverback, RCA Cable for Subwoofer or Stereo — Sewell Direct
Straight Wire Concerto High Quality Subwoofer Cable – Aperion Audio
Canare HIFI RCA Y Adapter Cable Subwoofer Y Cable 1x Cinch to 2x Cinch audio | eBay
FosPower Y Adapter [8 inch] 2 RCA (Male) to 1 RCA (Female) Stereo Audio Y Adapter Subwoofer Cable [24k Gold Plated] 2 Male to 1 Female Y Splitter Connectors Extension Cord - Walmart.com
RCA Y Adapter Cable Splitter (6 Inch) - RCAF to Dual RCA Y-Cable 1-Female to 2-Male Connector Wire Cord Plug Jack for Digital Audio or Subwoofer - (Stereo Female to Two RCA