Condition: 100% Brand New Item Type: Car Audio Converter Material: Plastic Color: Transparent Black Fitment: Universal fitment Wiring: White Wire: Connected to the positive pole of left channel Black-White Wire: Connected to the negative pole of left channel Gray Wire: Connected to the positive pole of right channel Gray-Black Wire: Connected to the negative pole of right channel Black Wire: Connected to the ground wire Red Wire: Connected to DC12V power supply (can be connected in parallel with the subwoofer's 12V power wire) Blue Wire: Connected to the subwoofer's REM binding post Package List 1 x Converter 1 x Wire Harness 1Used to convert the high audio signal of a speaker into a low frequency signal. 2Improve the sound quality, reduce the signal attenuation, achieve better sound effect. 3The installation is simple and only needs the correct wiring. 4Made of quality plastic material, durable and sturdy, having long service time. 5Wonderful accessory for auto car audio modification, directly fitment.