- For connecting amplifiers to factory installed radios ,- Generates a preamplifier signal from the speaker outputs of a radio ,- Suitable for the following radio output power: max. 40 W (music) per channel, min. 5 W (music) - Connection (Input): 4x Open Ends ,- Connection (Output): 2x RCA Socket, gold-plated ,- Distortion: Under 0.001 % ,- Transfer Ratio: 3.6 : 1 2 years legal warranty only