Cerwin Vega Pro Cv-900 900-Watt High-Performance Professional Power Amplifier (Discontinued by Manufacturer) 1800W Max, Freq Resp: 20~20 kHz @ +0/-0.3 Db Signal To Noise Ratio: 100 Db Stereo Output Power: 2 ohms @ 420W; 4 ohms @ 320W; 8 ohms @ 210W