ESX POWER4 Active Module

The ESX POWER4 is a high-performance digital Class D amplifier module designed for retrofitting and powering passive subwoofer enclosures. Thanks to its compact design and an output power of 460 watts RMS at 4 ohms, the module is ideal for space-saving car audio installations.

With an efficiency of up to 84%, the POWER4 operates particularly efficiently. The integrated EPS® PRO technology enables connection to modern factory-installed radios and sound systems with speaker diagnostics. Three switchable input resistances and an adjustable high-level input sensitivity are available for this purpose.

For custom bass tuning, the module features an adjustable low-pass and subsonic filter, a bass boost, and a phase switch. A three-stage limiter function helps protect connected subwoofers from overload.

The POWER4 is particularly well-suited for retrofitting compatible passive subwoofer enclosures from ESX, Musway, and HiFonics that feature Quick-Connect terminals. A wired bass-level remote control allows you to conveniently adjust the bass level from the driver's seat.

Technical Specifications

Amplifiers and Power

• Model: ESX POWER4

• Product Type: Active Amplifier Module for Subwoofer Enclosures

• Amplifier Technology: Digital Class D

• Number of channels: 1 (mono)

• RMS output power at 4 ohms: 1 × 460 watts

• Permissible speaker impedance: 4–8 ohms

• Efficiency: up to 84%

• Frequency response (−3 dB): 7–120 Hz

• Damping factor: greater than 200

• Signal-to-noise ratio: 102 dB

• Total Harmonic Distortion (THD at 1 watt RMS): less than 0.02%
  
  

Crossover Networks and Sound Settings

• Low-pass filter: 40–120 Hz

• Low-pass slope: 12 dB/octave

• Subsonic filter: 5–35 Hz

• Subsonic slope: 12 dB/octave

• Bass Boost: 0–6 dB

• Bass boost frequency: 45 Hz

• Phase switch: 0° / 180°

• Three-stage limiter function

• Clipping LED for clipping indication
  
  

Connections and Input Sensitivity

• RCA Low-Level Input

• High-Level Input

• RCA input sensitivity: 0.2–5.5 V

• High-level input sensitivity: 0.5–15 V or 1.5–40 V

• Switchable high-level input range: 15 V / 40 V

• EPS® PRO Input Impedances: 10 / 150 / 600 ohms, switchable

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

• Start-stop function: yes

• Start-stop operation according to the manufacturer: up to 7 V for 5 seconds

• Wired Bass Level Remote Control
  
  

Dimensions and Installation

• Width: 113 mm

• Height: 130 mm

• Depth: 125 mm

• Required mounting opening: 85 × 109 mm

• Equipment fuses: 2 × 25 A

• Suitable for compatible subwoofer enclosures with Quick-Connect terminals

• Can be retrofitted into compatible passive enclosures from ESX, Musway, and HiFonics