BOSS Audio Systems B15N Noise Filter For Car Audio Sound Systems - Ground Loop Isolator For Crossover Stereo Equalizer Amplifier Subwoofer - Walmart.com
OEHLBACH 9052 Audio Linear 8, RCASeparation Filter/Noise Suppressor/Ground Loop Isolator, Perfect for Subwoofer : Amazon.co.uk: Electronics & Photo
Amazon.com: GROWORD Ground Loop Isolator, Hum/Buzz/Noise Eliminator for Home Theatre, Speaker or Subwoofer Connected to Cable, 2-Pack Isolation Transformer for Cable TV Applications & Antenna(5-1218MHZ) : Electronics