Soundstream PN4.520D 520W 4 Channel Class D Picasso Series Compact Amplifier PN4520D Power Handling: 100W RMS x 4 @ 4 Ohms / 130W RMS x 4 @ 2 Ohms / 160W RMS x 2 [Bridged] @ 4 Ohms | Small Compact 4.75" Wide Chassis 4-ohm Bridged/2-ohm Stereo Class D Full Range | 2-Ohm Stable Class D Monoblocks | MOSFET PWM Power Supply 80Hz 12dB HP or LP Crossover (2/4 ch.) | 50-250Hz Variable 12dB LP Crossover (mono) | 10-50Hz Variable 12dB Subsonic Crossover (mono) 12dB 45Hz Bass Boost (mono) | 200mv-6V Low Level Input Sensitivity High Level Input | Dimensions: 4.75" W x 1.5" H x 9"