ESX Audio

ESX QL800.4 4-Channel Class D Amplifier

Amplifier

£259.99
Available to order
Amplifier SKU QL800.4 Manual included
Fitment System planning support
Tech specs Shown below
Manuals/downloads Download linked
Warranty Manufacturer backed
Plan the system before checkout Check channel layout, power, impedance and DSP requirements before choosing wiring or speakers.
Why choose this product?

The ESX QL800.4 is a QUANTUM QL 4-channel Class D digital amplifier for compact car audio installations. The official ESX page and owner manual confirm 4 x 125W RMS at 4 ohm, 4 x 200W RMS at 2 ohm and 2 x 400W RMS bridged at 4 ohm.

It includes high-level inputs with EPS, auto turn-on, Start/Stop readiness, a MOSFET PWM power supply, 3-way protection, 2/4-channel input selection, copy mode for CH3/4 to CH1/2, bandpass-capable filtering and a compact bass remote controller.

Key specifications

  • 4-channel Class D digital amplifier
  • 4 x 125/200W RMS at 4/2 ohm
  • 2 x 400W RMS at 4 ohm bridged
  • High-level inputs with Error Protection System (EPS)
  • HPF 50-5000 Hz on CH1/2
  • HPF 10-500 Hz and LPF 50-5000 Hz on CH3/4
  • Copy mode CH3/4 > CH1/2, bass boost 0-12 dB and bandpass function
  • Dimensions 226 x 43 x 120 mm

Best used for

Use the QL800.4 for a compact 4-channel speaker amplifier, a bridged two-channel setup, or a front-stage plus subwoofer system where a space-saving amplifier and remote bass control are useful.

Setup note

System design and channel assignment matter on bridgeable multi-channel amplifiers. If you are unsure how to wire this into your vehicle, send us your system details by WhatsApp or email before ordering and we will help check the setup.

Key features
• 4-channel Class D digital amplifier
• 4 x 125/200W RMS at 4/2 ohm
• 2 x 400W RMS at 4 ohm bridged
• High-level inputs with Error Protection System (EPS)
• Auto turn-on and Start/Stop ready
• Compact bass remote controller
• Copy mode CH3/4 > CH1/2
• Dimensions 226 x 43 x 120 mm
Technical details
Specifications • Advanced Class D Technology with very high Efficiency • Selected and audiophile tuned Components • Massive Aluminum Heatsink • Heavy lateral Die-cast Parts • High Level Inputs with Error Protection System (EPS) • Auto Turn-On Function • Start/Stop Ready • MOSFET PWM Power Supply • 3-Way Protection Circuit • Compact Bass Remote Controller • 4-channel Class D digital amplifier • 4 x 125/200W RMS at 4/2 ohm • 2 x 400W RMS at 4 ohm bridged • HPF 50-5000 Hz (CH1/2) • HPF 10-500 Hz (CH3/4) • LPF 50-5000 Hz (CH3/4) • Copy mode CH3/4 > CH1/2 • Bass Boost 0-12 dB • Bandpass function • Input selector • Dimensions 226 x 43 x 120 mm • Efficiency up to 86%
Compatibility and support

For vehicle-specific advice, send your vehicle make, model, year, current factory audio setup and what you want to improve.

We reply by email or WhatsApp so you have the recommendation in writing.

Downloads
Download owner manual Manufacturer documentation supplied where available.

Need fitment help?

Ask before ordering if the vehicle, wiring or DSP setup is unclear.

Send the make, model, year, factory audio setup and what you want to improve. We’ll reply in writing so you have the advice to refer back to.

WhatsApp compatibility help Email us
ESX QL800.4 4-Channel Class D A... £259.99