Compatible with the IMPULSE 4.320 four-channel digital amplifier, IMP EXTENSION I/O 150 extension cables with Plug & Play connections offer total freedom of installation, as they can link each amplifier channel to any of the loudspeakers. At 1.5 meters long, they are also twisted for effective interference elimination. With these cables, you benefit from an input/output extension: "input" to send the audio signal from the head unit to the amplifier, and "output" to transmit the output signal from the amplifier to the original audio system.