MB Quart Formula series four channel car audio amplifier featuring innovative sound quality and power technology. The FA1-400.4 is a 400 watt bridgeable car audio amplifier. Formula amplifiers feature DC Sensing to allow any amplifier to be easy integrated into an OEM system by simply adapting a RCA cable from the source unit.Weight 8.9 lbsType AmplifierBrand MB QuartSeries FormulaCategory MobileCondition NewColor BlackWarranty 1 YearAmp Class Class SQ (Class A/B)Amp Total Channels 4Amp Max Power (watts) 400Amp Power @ 2 Ohms (ch x watts) 4 x 50Amp Power @ 4 Ohms (ch x watts) 4 x 100Amp Crossover ElectronicAmp Variable High Pass Crossover 12dB per Octave CH1 & CH2: Switched Full/HPF 50Hz-500Hz, CH3 & CH4: Switched Full/HPF 50Hz-500HzAmp Variable Low Pass Crossover 12dB per Octave CH1 & CH2: Switched Full/LPF 50Hz-250Hz, CH3 & CH4: Switched Full/LPF 50Hz-250HzAmp Bass Boost 0-9dBAmp Variable Voltage 0.02-9VAmp Signal to Noise > 90dBAmp Frequency Response 10Hz-45KHzAmp Total Harmonic Distortion (THD) < 0.5%Amp Speaker Level Audio Inputs RCA JackAmp Power Terminal 12v/GND 4 AWGAmp Speaker Terminal Wire Gauge 12 AWGAmp Fusing 20A x 2Proposition 65 Notice WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.