Soundstream ST4.10000D Compact 4-Channel Car Amplifier 90WX4 - ST4.1000D 90 watts RMS x 4 at 4 ohms (125 watts RMS x 4 at 2 ohms) 250 watts x 2 bridged at 4 ohms Mosfet power supply Preamp and speaker-level inputs Variable high- and low-pass filters (35-250 Hz, 12 dB/octave)