The Proel HPD2004 is a 4-channel digital power amplifier delivering 500W per channel and 2 channels delivering 1000W. It features a Class D amplifier, 35 dB / 32 dB gain control, and a frequency response of 20 Hz to 20 kHz. The Proel HPD2004 digital amplifier features XLR / Jack combo input connectors and Speakon output connectors. Unlike other digital amplifiers in this price range, it uses Pulse Width Modulation (PWM) technology, delivering significantly superior sound quality even at high power levels.