High Performance Marine Grade 4/3/2 Channel Operation Non-Corrosive Heat Sink Conformal Coated Printed Circuit Boards 70 x 4 into 4 Ohms 20Hz-20kHz/.01%THD 140 x 4 into 1 Ohm 20Hz-20kHz/.01%THD 520 watts x 1 into 4 Ohms 20kHz/.01%THD MOFSET Output Design Speaker Terminal Splash Protector Boots Anti-Corrosion Gold Plated Speaker Terminals Hi/Low Pass Electronic Crossover