ESX QL750.1

The ESX QL750.1 from the QUANTUM series is a compact, high-performance Class D mono amplifier designed specifically to drive subwoofers. Despite its small enclosure size, the digital amplifier delivers up to 750 watts RMS into 1 ohm and offers extensive adjustment options for precise tuning of bass reproduction.

Features include an adjustable low-pass filter, a subsonic filter, a bass boost, and continuously variable phase control. Thanks to its high-level inputs with an automatic power-on function and EPS protection circuit, the amplifier is also suitable for integration into existing factory sound systems. A wired bass-level remote control allows for convenient adjustment of the subwoofer level from the driver’s seat.

Technical Specifications

Amplifier power

• Amplifier Type: Digital Mono Amplifier

• Series: ESX QUANTUM QL

• Amplifier Class: Class D

• Channels: 1

• 1 × 300 watts RMS at 4 ohms

• 1 × 500 watts RMS at 2 ohms

• 1 × 750 watts RMS at 1 ohm

• 1 × 600 watts max. at 4 ohms

• 1 × 1,000 watts max. at 2 ohms

• 1 × 1,500 watts max. at 1 ohm

• Minimum impedance: 1 ohm

• Efficiency: up to 92%
  
  

Audio Characteristics

• Frequency response (−3 dB): 10–150 Hz

• Damping factor: over 220

• Signal-to-noise ratio: over 81 dB

• Total Harmonic Distortion plus Noise (THD+N): less than 0.01%

• Input sensitivity: 0.2–5 V
  
  

Crossover Networks and Sound Settings

• Low-pass filter: 40–150 Hz, continuously adjustable

• Subsonic filter: 10–40 Hz, continuously adjustable

• Bass Boost: 0–18 dB at 40 Hz

• Phase Control (Phase Shift): 0–180°, continuously adjustable
  
  

Connections and Features

• RCA (low-level) inputs

• High-Level Inputs

• Stereo RCA full-range outputs (line out)

• Automatic Power-On Function (Auto Turn-On)

• Activation via DC offset or audio signal

• EPS (Error Protection System) for integration into factory-installed sound systems

• Start-stop capable

• Connector for external bass level remote control

• External bass level remote control included
  
  

Power Supply and Dimensions

• Operating voltage: 12-V automotive electrical system

• Start-stop capability according to the manufacturer: up to 8.5 V

• External fuse: 70 A

• Width: 226 mm

• Height: 43 mm

• Depth: 120 mm
  
  

Special Features

• Very compact design for space-saving installations

• High output power at a minimum impedance of 1 ohm

• Efficient Class D technology with low heat generation

• Extensive filter and adjustment options for subwoofers

• Integration into OEM audio systems via high-level inputs

• Automatic activation is possible without a separate remote signal

• Bass level can be easily adjusted using the included remote control