ESX QM500.1

The ESX QM500.1 from the QUANTUM series combines powerful Class D amplifier technology with an exceptionally compact design. Despite its small size, this digital mono amplifier delivers up to 500 watts RMS into 2 ohms and is ideal for driving high-performance subwoofers.

Modern Class D technology enables high efficiency of up to 86% with minimal heat generation. High-quality, carefully matched components, an aluminum heat sink, and sturdy cast aluminum side panels ensure a solid construction.

Thanks to its built-in high-level inputs with EPS® (Error Protection System) and automatic power-on function, the QM500.1 can be easily integrated into existing factory sound systems. Its start-stop capability ensures reliable operation even during brief power fluctuations.

A variable subsonic filter, an adjustable low-pass crossover, a bass boost, and continuous phase control are available for precise bass tuning. The included bass level remote control allows you to conveniently adjust the subwoofer volume from the driver's seat.

Technical Specifications

Amplifier power:

• RMS output power at 4 ohms: 1 × 280 watts

• RMS output power at 2 ohms: 1 × 500 watts

• Maximum output power at 4 ohms: 1 × 560 watts

• Maximum output power at 2 ohms: 1 × 1,000 watts

• Amplifier Class: Class D Digital

• Number of channels: 1 (mono)

• Efficiency: Up to 86%
  
  

Audio Features:

• Frequency response (−3 dB): 16–500 Hz

• Signal-to-noise ratio: Over 98 dB

• Damping factor: Over 100

• Total Harmonic Distortion plus Noise (THD+N): Less than 0.05%

• Input sensitivity: 0.2–5 V
  
  

Crossover Networks and Adjustment Options:

• Subsonic filter: 10–40 Hz, variable

• Low-pass filter (LPF): 50–5,000 Hz, variable

• Bass Boost: 0–18 dB at 40 Hz

• Phase control: 0–180°, continuously adjustable

• External bass level remote control: Yes
  
  

Connections and Features:

• RCA inputs: Yes

• High-level inputs: Yes, via cable connector

• EPS® (Error Protection System): Yes

• Automatic power-on function: Yes, via DC or signal detection

• Full-range RCA outputs: Stereo

• MOSFET PWM power supply: Yes

• 3-stage protection circuit: Yes

• Start-stop capability: Yes, up to 7.5 V

• External fuse: 50 A

• Aluminum heat sink: Yes

• Cast aluminum side panels: Yes
  
  

Dimensions:

• Width: 190 mm

• Height: 35 mm

• Depth: 102 mm (according to the ESX product page)