ower 4 Channels ? Independant front and rear 12dB stereo crossover 55Hz to 5.5KHz ? Seperate front and rear high/low/full range select switch ? 4 channel/2 channel or 2 channel with bass select ? Seperate front and rear mono/stereo/bridged select feature ? 18dB bass control at 45Hz select feature ? Protection against: reverse voltage, over voltage, speaker short, and thermal overload ? Heavy duty construction ?Output power :50x4@4ohms, 90x4@2ohms, and 180x2 4ohms bridged ?Transient distortion :<> 95dB ?Bass boost :+ 18dB @45Hz ?Input sensitivity :250mV - 2.5V ?Crossover :55Hz-5.5KHz variable 12dB ?Fuse :40A x1 ?Dimensions :10 3/8 " x 16 1/2" x 2 3/8"