The FDS 4.350 is the 4-channel model (4 x 58 Watts RMS) and the most versatile of the range. It can operate in 4-, 3- or 2-channel mode. In most cases, it will be used to amplify a car’s front and rear speaker drivers. It can also be used to drive front speaker drivers and a small subwoofer, for a small installation which stays simple and integrated.