ESX QL600.4 (24 volts)

The ESX QUANTUM QL600.4 (24V) is a powerful and compact 4-channel digital amplifier designed specifically for vehicles with a 24-volt electrical system. This makes it ideal for use in trucks, tour buses, and other commercial vehicles.

Modern Class D amplifier technology delivers high output power while requiring minimal space and achieving an efficiency of up to 86%. High-quality, carefully tuned components ensure precise sound reproduction. The robust aluminum housing with solid cooling fins supports reliable heat dissipation.

With an RMS output power of 4 x 100 watts into 4 ohms or 4 x 170 watts into 2 ohms, the amplifier offers ample power reserves for demanding speaker systems. In bridge mode, up to 2 x 340 watts RMS at 4 ohms is available.

Thanks to variable high-pass and low-pass filters, a bandpass function, and an adjustable bass boost, the amplifier can be flexibly adapted to different speaker configurations. The built-in high-level inputs with an EPS protection system also allow for connection to factory-installed car stereos. A compact bass-level remote control is included with the unit.

Technical Specifications

General Characteristics

• Model: ESX QUANTUM QL600.4 (24V)

• Amplifier Type: 4-Channel Digital Amplifier

• Amplifier Class: Class D

• Operating voltage: 24 volts

• Suitable for: Trucks, tour buses, and commercial vehicles with a 24-volt electrical system

• Efficiency: Up to 86%

• MOSFET PWM Power Supply

• High-quality, audiophile-tuned components

• Solid aluminum heat sink with cast aluminum side panels
  
  

RMS Output Power

• 4 x 100 watts RMS at 4 ohms

• 4 x 170 watts RMS at 2 ohms

• 2 x 340 watts RMS at 4 ohms (bridged)
  
  

Maximum Output Power

• 4 x 200 watts MAX at 4 ohms

• 4 x 340 watts MAX at 2 ohms

• 2 x 680 watts MAX at 4 ohms (bridged)
  
  

Audio Characteristics

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

• Damping factor: Over 220 (manufacturer's specification in dB)

• 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 and 2

• Switch Modes: Full / HP / Copy

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

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

Crossover Channels 3/4

• Filter Modes: Full / HP / LP-BP

• High-pass filter (HPF): 10–500 Hz

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

• Bandpass function: Available

• Bass Boost: 0–12 dB at 40 Hz
  
  

Connections and Features

• RCA low-level inputs

• High-Level Inputs with Error Protection System (EPS)

• Full-range stereo RCA outputs

• Input selector switch

• Automatic power-on function via DC detection or audio signal

• Start-stop capable up to 17 volts

• 3-stage protection circuit

• Connector for external bass level remote control

• Compact bass level remote control included
  
  

Dimensions and Fuse Protection

• Width: 226 mm

• Height: 43 mm

• Depth: 120 mm

• External fuse: 40 A