ESX QE900.4 - 4 Channel Amplifier




  • 4-Channel Class D Digital Amplifier
  • 4 x 150/225 Watts RMS @ 4/2 Ω
  • 2 x 450 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
  • Bass Boost 0-12 dB
  • Bandpass Function
  • Input Selector
  • Dimensions 280 x 46 x 165 mm
  • Efficiency up to 84%


  • Advanced Class D Technology with very high Efficiency
  • Selected and audiophile tuned Components
  • Massive Aluminum Heatsink
  • Heavy 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
  • Compact Bass Remote Controller


The newly developed ESX QUANTUM QE series is a class of its own. Conventional high power digital amplifiers usually cause interferences in the vehicle and disturb the radio reception. Not so with the new QE models: During the development period, special attention was paid to achieve an emission-free music playback. Also the sound is perfect,  because high-quality components guarantee an audiophile sound experience at its best. The features are also impressive: Auto Turn-On Function, EPS, variable crossover filters – everything your heart desires is on board. High-quality connectors and screwed RCA sockets complete the perfect appearance. All amplifiers are delivered with a sophisticated level remote control, which can be installed very space-saving with or without housing.

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