The JENSEN XDA94RB amplifier was engineered with specific linear circuitry. The 4-channel configuration ensures an overall improvement in sound quality and power output. It also reduces distortion and refines efficiency. The Jensen DSP App connects to your amplifier via Bluetooth and give control over the various functions. Given the vast amounts of dynamic power in your 4-channel amplifier, we had a thermal and DC offset safety protection built-in. New condition. The JENSEN XDA94RB amplifier was engineered with specific linear circuitry. The 4-channel configuration ensures an overall improvement in sound quality and power output. It also reduces distortion and refines efficiency. The Jensen DSP App connects to your amplifier via Bluetooth and give control over the various functions. Given the vast amounts of dynamic power in your 4-channel amplifier, we had a thermal and DC offset safety protection built-in. New condition.