ESX QS-TWO-ISO

The ESX QUANTUM QS-TWO-ISO is an exceptionally compact 2-channel digital amplifier that delivers impressive power and outstanding sound quality despite its small size. With up to 2 × 95 watts RMS into 2 ohms, this power amplifier is ideal for driving high-power speaker systems. In bridged mode, it delivers up to 190 watts RMS into 4 ohms, making it capable of driving a subwoofer as well.

Thanks to modern Class D technology, the amplifier achieves an efficiency of up to 90%. As a result, it operates particularly efficiently, places only a minimal load on the vehicle’s electrical system, and generates comparatively little heat. The solid cast aluminum heat sink also ensures reliable heat dissipation.

A special feature of the QS-TWO-ISO is the included, pre-assembled 60-cm ISO Plug+Play wiring harness. For vehicles with compatible ISO connectors, this allows for easy integration into the existing audio system—for example, directly behind the car stereo.

For flexible signal connectivity, both RCA inputs and high-level inputs with an integrated Error Protection System (EPS) are available. The automatic power-on function makes it easy to retrofit factory-installed radios. In addition, the amplifier features a stereo RCA output that can be used to connect an active subwoofer, for example.

With a frequency range of 10 Hz to 60 kHz and extremely low distortion, the QS-TWO-ISO is also suitable for high-quality music playback and high-resolution audio signals.

Technical Specifications

General Characteristics

• Manufacturer: ESX

• Series: QUANTUM

• Model: QS-TWO-ISO

• Amplifier Type: 2-Channel Digital Amplifier

• Amplifier Technology: Class D

• Number of channels: 2

• Speaker impedance: 2–8 ohms

• Bridge mode: Yes, at 4 ohms

• Efficiency: Up to 90%

• Cooling: Cast aluminum heat sink

• Start-stop capability: Yes
  
  

RMS Output Power at 13.8 V

• 2 × 52 watts RMS at 4 ohms

• 2 × 95 watts RMS at 2 ohms

• 1 × 190 watts RMS bridged at 4 ohms
  
  

Audio Characteristics

• Frequency range: 10 Hz – 60,000 Hz

• Total Harmonic Distortion plus Noise (THD+N) at 5 watts: 0.005%

• Signal-to-noise ratio: 100 dB

• Damping factor: 140

• Input sensitivity: 220 mV – 5.4 V
  
  

Crossover Networks

• Crossover Mode: Full-range / High-pass / Low-pass

• High-pass filter (HPF): 80 Hz

• Low-pass filter (LPF): 80 Hz

• Filter slope: 12 dB/octave

• Filter frequencies: Fixed

• High-pass and low-pass filters: Switchable
  
  

Connections and Features

• RCA inputs: 2-channel stereo (L/R), via cable connectors

• RCA outputs: 2-channel stereo (L/R), via cable connectors

• High-level inputs: 2-channel stereo (L/R)

• Error Protection System (EPS): Yes

• Automatic power-on function: Yes

• Automatic Power-On: VOX / DC

• ISO Plug+Play connection: Yes

• ISO wiring harness: 60 cm

• Connecting an active subwoofer via RCA output: Possible
  
  

Power Supply and Dimensions

• Operating voltage: 7.1–15.9 volts DC

• External fuse: 20 A

• Width: 90 mm

• Height: 35 mm

• Length: 70 mm