ESX QL800.4

The ESX QL800.4 from the QUANTUM QL series is a powerful and compact 4-channel digital amplifier that combines modern Class D technology with high-quality craftsmanship and versatile adjustment options.

The QUANTUM QL amplifiers are the more compact counterparts to the QUANTUM QE series and are particularly well-suited for vehicles with limited space for installing a power amplifier. Despite its space-saving design, the QL800.4 offers high output power, an efficiency of up to 86%, and precise signal processing.

Carefully selected, audiophile-tuned components are used to ensure high-quality sound reproduction. A solid aluminum heat sink with sturdy die-cast aluminum side panels ensures efficient heat dissipation.

With its extensive filter settings, the amplifier can be flexibly used with various speaker configurations. The built-in high-pass and low-pass filters allow for precise frequency adjustment, while the bandpass function offers additional tuning options.

Thanks to its high-level inputs with the EPS® Error Protection System, the ESX QL800.4 is also suitable for integration into existing factory-installed sound systems. The automatic power-on function, start-stop compatibility, and the included compact bass-level remote control round out the extensive feature set.

Technical Specifications

General Characteristics

• Model: ESX QL800.4

• Series: QUANTUM QL

• Amplifier Type: 4-Channel Digital Amplifier

• Amplifier Technology: Class D

• Number of channels: 4

• Operating voltage: 12-volt vehicle electrical system

• Efficiency: up to 86%

• Power Supply: MOSFET PWM

• Heat Sink: Solid Aluminum

• Side panels: Die-cast aluminum

• Protection Circuit: 3-Stage Protection System
  
  

RMS output power at 14.4 volts

• 4 × 125 watts RMS at 4 ohms

• 4 × 200 watts RMS at 2 ohms

• 2 × 400 watts RMS at 4 ohms (bridged)
  
  

Maximum output power at 14.4 volts

• 4 × 250 watts MAX at 4 ohms

• 4 × 400 watts MAX at 2 ohms

• 2 × 800 watts MAX at 4 ohms (bridged)
  
  

Audio and Performance Parameters

• Frequency response (-3 dB): 5 Hz – 55,000 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 volts
  
  

Crossover Filters, Channels 1/2

• Switch Mode: FULL / HP / DUPE-COPY

• High-pass filter (HPF): 50 – 5,000 Hz

• Copy Mode: Apply the settings from Channel 3/4
  
  

Crossover Channels 3/4

• Filter Mode: FULL / HP / LP-BP

• High-pass filter (HPF): 10–500 Hz

• Low-pass filter (LPF): 50–5,000 Hz

• Bass Boost: 0–12 dB at 40 Hz

• Bandpass function: available
  
  

Connections and Features

• Low-level RCA inputs: available

• High-level inputs: available

• EPS® Error Protection System: included

• Automatic power-on function: via DC offset or audio signal

• Start-stop capability: up to 8.5 volts

• Bass Level Remote Control: Available

• Full-range RCA outputs: Stereo

• Input selector switch: included

• Bridge operation: possible
  
  

Dimensions and Power Supply

• Width: 226 mm

• Height: 43 mm

• Depth: 120 mm

• Recommended external fuse rating according to the manufacturer: 80 A

• Suitable for 12-volt vehicle electrical systems with a negative ground
  
  

What's Included

• ESX QL800.4 4-Channel Digital Amplifier

• Compact Bass Level Remote Control