Check the listing for details. Car Power Filter EMI Noise Ground Loop Isolator Suppressor for Auto Stereo Audio. Condition: New. Listed at 21.90 USD. Car Power Filter EMI Noise Ground Loop Isolator Suppressor for Auto Stereo Audio Radio Stereos Amplifier Amp Speaker Equalizer Subwoofer 12V. - 【How to connect】The red wire connects to the battery 12v+, the yellow wire connects to the power cable of the stereo where the electricity is going.
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