ESX QM500.4 - 4 Channel Amplifier




  • 4-Channel Class D Mini Digital Amplifier
  • 4 x 80/125 Watts RMS @ 4/2 Ω
  • 2 x 250 Watts RMS @ 4 Ω bridged
  • HPF 50-5000 Hz (CH1/2)
  • HPF 10-500 Hz (CH3/4)
  • LPF 50-5000 Hz (CH3/4)
  • Copy-Modus CH3/4 > CH1/2
  • Bandpass Mode
  • Dimensions 220 x 51 x 362 mm
  • Efficiency up to 83%


  • Advanced Class D Technology with very high Efficiency
  • Selected and audiophile tuned Components
  • Compact Aluminum Heatsink and lateral Die-cast Parts
  • High Level Inputs with Error Protection System (EPS)
  • Auto Turn-On Function
  • Start/Stop Ready
  • MOSFET PWM Power Supply
  • 3-Way Protection Circuit
  • RCA & High Level Inputs (via Molex)
  • Compact Bass Remote Controller
Digital amplifier power has never been more compact and affordable: With a size of just 190 x 35 x 102 mm, the three new ESX  QUANTUM QM miniature power plants are convincing all along the line. The QM amps offer state-of-the-art technology in a very small space and are all solidly constructed. All three amps are based on the somewhat larger sibling models of the  ESX QUANTUM QL series, only a bit more compact and much easier to install. Thanks to the high level inputs including EPS and the automatic turn-on function, they are also perfectly suited for integration in factory sound systems. Each model is also equipped with a compact bass level remote control.

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