Sony XM-4S Slim Series 4-channel car amplifier 50 watts RMS x 4 XM4S * 4-channel car amplifier * 50 watts RMS x 4 at 4 ohms (60 watts RMS x 4 at 2 ohms) * 50 x 2 watts RMS + 120 x 1 watts RMS power bridged output at 4-ohms (4-ohm stable in bridged mode) * switchable high-pass filter on front two channels (80 Hz, -12 dB/octave) * switchable low-pass filter on rear two channels (80 Hz, -18dB/octave)