Amazon.com: Scosche LOC2SL Line Output Converter Adjustable Amplifier Add On Module for Car Stereo, 2-Channel Signal Sensing Speaker Wire to RCA Adapter with Remote Control Knob, Black : Electronics
Whirlwind LM2B 2-Channel Line Level Converter LM2B B&H Photo
Amazon.com: RCA Line Audio Output Converter: Speaker to Line Level Converter Convert Speaker Level Outputs to Line Level Signals Allow Speaker Line to Connect to Auxiliary Inputs of Portable Sound Systems :
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Jensen Iso-Max SP-2SX 2 Channel speakON Speaker Level to XLR Line Level Converter Adapter
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