HiFonics ZXR500/4E

The HiFonics ZXR500/4E from the ZEUS POWER EXPANSION series is a powerful and exceptionally compact 4-channel digital amplifier featuring state-of-the-art Class D technology. Thanks to its high efficiency, high-quality components, and extensive adjustment options, this power amplifier offers an impressive combination of power, sound quality, and versatility.

The ZEUS E-Class expands the proven ZXR amplifier series with highly efficient models featuring compact heat sinks. The amplifier series was named “PRODUCT OF THE YEAR 2025” by the trade magazine Car & Hifi in its 1/2025 issue.

With an RMS output power of 4 × 75 watts into 4 ohms or 4 × 125 watts into 2 ohms, the ZXR500/4E is suitable for driving high-power speaker systems. In bridge mode, up to 2 × 250 watts RMS at 4 ohms is available.

For flexible sound customization, the amplifier features separately adjustable high-pass and low-pass filters for the front and rear channels. The built-in bass boost allows for additional adjustments in the low-frequency range.

Thanks to high-level inputs with EPS® (Error Protection System), an automatic power-on function, and start-stop compatibility, the power amplifier can be integrated into many modern vehicles equipped with factory-installed radio systems.

The high-quality enclosure, featuring die-cast aluminum side panels and a blue-illuminated HiFonics logo panel, rounds out the design.

Technical Specifications

Amplifier Power (RMS)

• Power at 4 ohms: 4 × 75 watts RMS

• Power at 2 ohms: 4 × 125 watts RMS

• Power at 4 ohms (bridged): 2 × 250 watts RMS

• Amplifier Class: Digital Class D

• Number of channels: 4

• Speaker impedance: 2–8 ohms

• RMS power specifications at 14.4 V and a maximum of 1% THD+N
  
  

Audio Characteristics

• Damping factor: greater than 200

• Signal-to-noise ratio: greater than 98 dB

• Distortion factor: less than 0.02%

• Input sensitivity: 200 mV – 6 V
  
  

Crossover Networks and Filters

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

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

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

• Low-pass filter (Rear): 50–5,000 Hz

• Bass Boost (Rear): 0–12 dB

• Bass boost frequency: 45 Hz

• Input selector switch: 2CH / 4CH
  
  

Connections and Features

• RCA inputs: available

• High-level inputs: available

• EPS® Error Protection System: included

• Automatic power-on function via high-level (DC) signal: available

• Start-Stop Compatibility: Available

• IFT (Interference-Free Technology): Available

• EMC-certified technology

• Carefully selected, audiophile-grade components

• Die-cast aluminum side panels

• HiFonics logo panel with blue backlighting
  
  

Electrical Specifications and Dimensions

• Operating voltage: 10.5–16 V

• Temporary voltage drop: up to 7 V for a maximum of 5 seconds

• Fuse rating: 2 × 25 A

• Width: 150 mm

• Height: 50 mm

• Length: approx. 253–254 mm