The SoundGate XR4 is a high-performance, adjustable, 4-channel radio replacement interface designed to seamlessly integrate new receivers or CD players into most factory amplified systems. Our universal 'pigtail' leads allow you to use factory match connectors, available from most Mobile Electronics retailers. With separate gain adjustments for all four channels, it will easily handle any of today's receivers, CD players or multi-media unit, including today's high-powered MOSFET units. With full DC isolation, proprietary transformers, and elimination of power resistors, you get 20 Hz to 20 KHz frequency response, and no noise! XR4 can easily handle up to 85 watts per channel of power.