Pioneer GM-6400F 600-Watt, 4-Channel Power Amplifier Four-channel car amplifier with 600-watt max power capability Delivers 60 watts x 4 at 4 ohms, 150 watts x 2 at 4 ohms, or 75 watts x 2 at 2 ohms Selectable low-pass filter (80 Hz, 12 dB per octave) Preamp- and speaker-level inputs for connecting to most source units