Pioneer GM-A4604 4-channel car amplifier - 40 watts RMS x 4 Brand: Pioneer Features: 4-channel car amplifier Switchable high- and low-pass filters (80 Hz, 12 dB/octave) on A channels Variable high- and low-pass filters (40-500 Hz, 12 dB per octave) on B channels Class AB amp technology, MOSFET power supply Series: GM Type: Amplifiers Amplifier Class: Class AB RMS Power: 40 watts RMS x 4 at 4 ohms (60 watts RMS x 4 at 2 ohms) 120 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)