ESX QL500.2

The ESX QL500.2 from the QUANTUM QL series is a powerful and compact 2-channel Class D amplifier that combines high output power with extensive adjustment options and modern digital technology. With up to 2 × 250 watts RMS at 2 ohms or 1 × 500 watts RMS in bridged mode at 4 ohms, this power amplifier is suitable for both high-power speaker systems and for driving a subwoofer.

Thanks to its built-in high-level inputs with an automatic power-on function, the amplifier can also be integrated into existing factory-installed audio systems. Its start-stop capability also makes it suitable for use in modern vehicles.

Adjustable high-pass and low-pass filters, a bandpass function, and a bass boost are available for flexible sound customization. The included bass-level remote control allows you to conveniently adjust the bass level from the driver's seat.

The compact enclosure makes installation easy, even in tight spaces. The combination of high performance, extensive features, and versatile connectivity options makes the ESX QL500.2 a powerful solution for demanding car audio installations.

Technical Specifications

Amplifiers and Output Power

• Model: ESX QL500.2

• Series: QUANTUM QL

• Amplifier Type: 2-Channel Digital Amplifier

• Circuit Technology: Class D

• Number of channels: 2

• Bridgeable operation: Yes
  
  

RMS output power at 13.8 V

• 2 × 150 watts RMS at 4 ohms

• 2 × 250 watts RMS at 2 ohms

• 1 × 500 watts RMS bridged at 4 ohms
  
  

Maximum output power at 13.8 V

• 2 × 300 watts MAX at 4 ohms

• 2 × 500 watts MAX at 2 ohms

• 1 × 1,000 watts MAX, bridged at 4 ohms
  
  

Audio and Sound Parameters

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

• Signal-to-noise ratio: over 81 dB

• Damping factor: over 220

• Total Harmonic Distortion plus Noise (THD+N): less than 0.01%

• Input sensitivity: 0.2 – 5 V
  
  

Crossover Networks and Tone Control

• Crossover modes: Full-range / High-pass / Low-pass / Bandpass

• High-pass filter (HPF): 10–500 Hz, continuously adjustable

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

• Bandpass function: Yes, achieved by combining a high-pass and a low-pass filter

• Subsonic Filter: Adjustable via high-pass filters

• Bass Boost: 0–12 dB at 40 Hz, adjustable
  
  

Connections and Features

• RCA inputs: 2-channel stereo

• RCA outputs: Stereo full-range output

• High-level inputs: Yes

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

• Remote Power-On: Yes

• Remote bass control: Yes

• Start-stop capability: Yes, up to 8.5 V according to the manufacturer's specifications

• Speaker connections: Stereo or mono bridged
  
  

Power Supply and Dimensions

• Operating voltage for power ratings: 13.8 V

• Recommended external fuse rating according to the manufacturer: 50 A

• Width: 226 mm

• Height: 43 mm

• Length: 120 mm

• Dimensions (W × H × L): 226 × 43 × 120 mm