5-Channel complete system amplifier with on-board electronic crossover and variable bass boost circuit.The Reference 5350a is the perfect complete sysem solution allowing you to drive front and rear speakers as well as subwoofers from a single amplifier. Port for future expansion products included. The 5350a comes outfitted with three variable 12dB per octave electronic crossovers allowing you to optimize system tuning based on speaker selections and location. Remote bass level control included.