This is a DUAL XAF340 car audio 340 watt 2-channel amplifier. This 340 watt MOSFET amp which is ideal for driving a single subwoofer or pair of subs features 3-way protection circuitry (thermal/short/impedance) making it virtually impossible to blow. It also features, a variable low pass crossover which helps protect speakers from life ending distortion by not letting high range frequencies get to your subs. By being equipped with this built-in crossover, you won't have to spend extra money on external crossovers. This amp also has a line input and line output which can be used for daisy chaining additional amplifiers. Additionally, the adjustable sensitivity input allows you the flexibility to dial in the perfect amount of bass to suit your taste. Equipped with 12dB bass boost, power/protect LED indicators and speaker level inputs. This unit has been remanufactured to 100% of its original factory specifications.