ESX Audio has an amazing history of manufacturing high quality, highly rated car audio components. The quantum amplifier line is no exception. With a size of just 6" x 10", this amplifier can be used in a variety of applications. It features a robust heavy die-cast heat sink containing a state of the art Class D platform, designed in house. The new Class D platform features an efficiency rating of up to 90% as well as supporting auto turn-on functionality. Please see the last two photos above of a review by the famous car&hifi magazine of Germany. 




RMS Power

  • 4 x 100 Watts @ 4 Ω
  • 4 x 100 Watts @ 2 Ω 
  • 2 x 200 Watts @ 4 Ω



  • HP 20-4000 Hz (CH1/2), HP 10-500 Hz (CH3/4)
  • LP 50-4000 Hz (CH3/4), Bandpass Mode CH3/4 > CH1/2



  • High-Level Inputs, with Auto Turn-On Function and EPS
  • Low-Level Inputs, RCA



  • Bass Boost 0-12 dB
  • Dimensions: 150 x 50 x 220 mm
  • Efficiency up to 90%


ESX Audio Q-FOURv2 Four Channel

$350.00 Regular Price
$270.00Sale Price