Enfig RWH-AUD2-HILO Enfig RWH-AUD2-HILO2(2)
Plug and play adapter that fixes low rear audio and low sub woofer problem on most Audi's 1998-2012 when replacing the factory radio. Also improves overall sound on BOSE systems. Will take care of most engine noise and turn on/Turn off pop the sometimes occurs. I like to call it my Audi magic box...