Massive Audio Hi-Low - Car Audio High Level Speaker Signal to Low Level RCA Converter, High to Low Level Signal Hi-Low Converter, Works for all Massive Audio Amplifiers (and most other brands) | SAVE 10% - Buy ANY 2 OF OUR PRODUCTS using Code MAD10OFF. Takes any speaker level stereo signal from any source (head-unit) and converts it to a perfect dual 4.5 Volt line level low distortion RCA output Plug & Play Installation, Compact Housing for easy install, Ground Noise Isolation Balanced Left/Right Matched Inputs, Music Signal Sensing Turn ON, Remote 12 Volt External Turn On Dual L/R Balanced 4.5 Outputs, Ideal for adding a subwoofer to your vehicle without giving up factory features Plug &amp; Play Installation Compact Housing Ground Noise Isolation Balanced Left/Right Matched Inputs Music Signal Sensing Turn On Remote 12 Volt External Turn On Dual L/R Balanced 4.5 Outputs Small Design for Easy Mounting Ideal For Adding After Market Equipment Without Giving Up Factory Features