MR1004 4-Channel Power AmplifierRiot 400W 4 Channel Full Range, Class A/B AmplifierFeatures:Weather Proof 400W MAX Power, 4 Channel 75W X 4 RMS @ 2 ohm 38W X 4 RMS @ 4 ohmFull Range, Class A/B,High and Low Level InputsPerformance SpecsTotal Power Output: 400 WattsPeak Power @ 2 : 100 Watts x 4RMS Power @ 4 : 38 Watts x 4Speaker Impedance: 2 to 8 T.H.D. (Total Harmonic Distortion): 0.01%Channel Separation : 60 dBS/N Ratio (A-Weighted): 90 dBFrequency Response:12 Hz to 22 kHz 1 dBWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.