ESX Audio QE900.4

ESX Audio QE900.4

Sound Express is the official USA distributor for ESX Audio


ESX Audio, located in Kronau Germany, is one of very few, high-quality amplifier manufactures left within the car electronics industry. The newly developed ESX QUANTUM QE series is in a class of its own. High-quality components such as low ESR capacitors, shielded inductors, overbuilt power supplies, and versatile crossovers guarantee an audiophile sound experience. Conventional high power class D amplifiers usually cause interferences within the vehicle and can even disturb the radio reception. During the development period, special attention was paid to achieve an emission-free music playback. Visually, the new flagships amplifiers are based on the previously established QUANTUM QE DSP line thus enabling versatile combinations. They are featured packed: Auto Turn-On, 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 the housing. All of ESX Audio's innovations have awarded them the prestigious and coveted EISA Award in the category “IN-CAR AMPLIFIER” as “Best Product 2019-2020”.


  • 4 x 150/225 Watts RMS @ 4/2 Ohms
  • 2 x 450 Watts RMS @ 4 Ohm bridged
  • HP 50-5000 Hz (CH1/2), HP 10-500 Hz (CH3/4)
  • LP 50-5000 Hz (CH3/4), Copy-Mode CH3/4 > CH1/2
  • Bass-Boost 0-12 dB, Bandpass Mode, Input Mode
  • High Level Inputs, Auto Turn-On Function
  • Compact Bass Remote
  • Dimensions: 280 x 46 x 165 mm
  • Efficiency up to 84%
    Amplifier Type

    Sound Express USA

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