Rockville RXD-M3 4000 Watt/2000w RMS Mono Class D 1 Ohm Amplifier Car Stereo Amp Rockville RXD-M3 4000 Watt/2000w RMS Mono Class D 1 Ohm Car Stereo Amplifier With Optical Coupler Technology. CEA Compliant Power Ratings: 1 Ohm: 1000 Watts x 1 Channel &lt;1% THD+N. 2 Ohm: 750 Watts x 1 Channel &lt;1% THD+N. 4 Ohm: 550 Watts x 1 Channel &lt;1% THD+N). RMS Power Ratings: 1 Ohm: 2000 Watts x 1 Channel. 2 Ohm: 1500 Watts x 1 Channel. 4 Ohm: 1100 Watts x 1 Channel. Peak: 1 Ohm: 4000 Watts x 1 Channel. 2 Ohm: 3000 Watts x 1 Channel. 4 Ohm: 2200 Watts x 1 Channel. High-Speed MOSFET Power Supply. Optical Coupler Class "D" Technology. Studio-Grade Bipolar Output Stage Transistors. Now exclusively with "Professional Peak Limiter Circuitry" which guarantees distortion free musical playback at all levels. Fully Adjustable 12dB / Octave Crossover with Differential Circuitry. Low Pass Filter: 50Hz - 250Hz. Subsonic Filter: 15Hz - 55Hz. Phase Control Switch. Full IC-Controlled Protection Circuitry. Remote Dashboard Subwoofer Control. Fully Adjustable 12dB Bass Equalizer. Mute and Delay Soft Start System. RCA Preamp Line Output. 8 Volt Preamp Circuitry. Status Mode LED Indicator. Minimum THD at Rated Power: 100dB. Frequency Response: 10Hz - 500Hz. Damping Factor: &gt; 275 @ 100Hz. 120 Amp External In-Line ANL Fuse Block. Dimensions: (W x H x L) 8.5" x 1.8" x 14.5".