PAC PDLC21 2-Channel Intelligent Digital Line Output Converter 2 Channel Intelligent Digital Line Output Converter Intelligent Signal Sensing Turn-on Circuit, Allows easy addition of aftermarket amplifiers to OEM radios Pre-Amp 10volt RCA Output, Enough power to cleanly drive any amplifier Ultra Low 50m Ohm output / 20 Ohm input impedance, Virtually impervious to noise interference SMT (Surface Mount Technology), Precision components for noise free operation