PIONEER IN-LINE RCA NOISE SUPRESSOR. RD-985
THE RD-985 Adaptor reduces the noise that gets in via the audio line when a car stereo with RCA pin jack is connected to the power amplifier..DO NOT INSTALL THE UNIT NEAR THE HEATER VENTS TO PREVENT MELFUCTION OF THE UNIT DUE TO HEAT. it will cost you over $200 to bring one from the internet