The completely redesigned ESX QUANTUM QE series is in a class of its own in many ways. Class D amplifier, high quality sound quality, good efficiency and small size are now in one and the same package! The design of the amplifiers follows the line of QUANTUM QE DSP amplifiers published earlier. All the amplifiers in the QUANTUM QE series are the same size, so you get a stylish whole!
The basics and connections are right when the device has automatic start, EPS (error protection systems) and adjustable crossover filters. High quality connections on both the power side and RCA connectors as well as at the speaker level. All QUANTUM QE series amplifiers also feature a compact, easy-to-place bass level control.

The collection’s rugged 4-channel amplifier Quantum 1200.4 won the Best Car Amplifier award in an EISA (Association of European Specialty Journal Editors) vote. Power in a small size with very high quality components!
Features
- Mono Digital subwoofer amplifier
- 1 x 450W rms 4ohm
- 1 x 850W rms 2ohm
- 1 x 1500W rms 1ohm
- Low pass filter 40-150 Hz
- Bass-Boost 0-18 dB
- Subsonic filter 10-40 Hz
- Dimensions 280 x 46 x 165 mm
- Efficiency 90%
- High quality components and cooling
- Speaker level inputs with fault protection
- Automatic start from speaker signal
- Compatibility with car Start / Stop systems
- MOSFET PWM power supplies, 3 times protection
- Comes with a small wired level control