RCA Mobile RC126W 600W Max, 12" Subwoofer - Sonic Electronix
Inakustik Star Y-split subwoofer Phono RCA audio cable
Amazon.com: Mediabridge™ Ultra Series RCA Y-Adapter (15 Feet) - 1-Male to 2-Male for Digital Audio or Subwoofer - Dual Shielded with RCA to RCA Gold-Plated Connectors - Black - (Part# CYA-1M2M-15B) :