The XDA92RB amplifier was engineered with specific linear circuitry. The 2-channel configuration ensures an overall improvement in sound quality and power output. It also reduces distortion and refines efficiency. The DSP App connects to your amplifier via Bluetooth and give control over the various functions. Given the vast amounts of dynamic power in your 2-channel amplifier, we had a thermal and DC offset safety protection built-in. New condition. CLASS D 2-CHANNEL AMPLIFIER your the 2-channel configuration ensures an overall improvement in sound quality and power output while reducing distortion and refining efficiency CLASS D EFFICIENT DESIGN produces 600 Watts of total peak power, 80 Watts RMS x 2 channels @ 4 ohms and 240 Watts RMS x 1 channel @ 4 ohms (bridged) RGB ILLUMINATION VIA BLUETOOTH APP the DSP app allows you to have full control over your amplifiers various functions such as: Illumination, Remote Bass, Frequency, Volume and Gain FULL RANGE CROSSOVERS BASS BOOST when constructing your 2-channel amplifier, we added a variable high pass and low pass crossover for versatility and use of full range speakers or subwoofer plus a variable bass boost at 45Hz SHORT CIRCUIT PROTECTION given the vast amounts of dynamic power in your 2-channel amplifier we had a thermal and DC offset safety protection built-in New Condition