Brax MX4 Pro 4-ch amplifier
- 4 x 300 Watts @ 4 Ohms
- 4 x 300 Watts @ 2 Ohms
- 4 x 300 Watts @ 1 Ohm
- 2 x 600 Watts bridged @ 4 Ohms
- 2 x 600 Watts bridged @ 2 Ohms
MX4 Pro
High-end 4-channel amplifier
Brax amplifiers represent German reference-grade engineering with no cost constraints.
Designed by the team behind Helix, these are built for installations where technical excellence matters more than price.
Brax exists for serious installations where proper system design, professional integration, and uncompromising performance justify the investment.
4 channel high-end car amplifier
- 4 x 300 Watts @ 4 ohms
- 4 x 300 Watts @ 2 ohms
- 2 x 600 Watts bridged @ 4 ohms
- 2 x 600 Watts bridged @ 2 ohms
Features
- Two digital stereo digital inputs in SPDIF format (optical and electrical) with a sampling rate up to 192 kHz
- DiSAC (Digital Signal Analog Controlled) volume control for the digital signal inputs, controllable via BRAX DSP
- Optimized quad-layer PCB design for maximized power and signal flow and increased output power
- Lossless switching of the input signals via relays with gold-plated contacts
- Best possible impulse response due to abstinence of coupling capacitors in the signal path
- Incredible damping factor of more than 1,400 @ 4 Ohms for perfect speaker control
- Maximized signal-to-noise ratio due to power supply synchronization
- Extremely complex and regulated switch-mode power supply
- Eightfold-contacted capacitors with a total capacitance of 40,000 μF and lowest possible ESR as well as a 300 A suppressor choke coil to smooth power supply peak currents
- Separate connector for BRAX power stabilizer
- Loudspeaker protection circuit via sophisticated high current power relays
- Specially designed toroidal transformers made of high permeability core materials for highest possible saturation currents
- 32 hand-selected high-end MOSFET transistors for lowest tolerances and outstanding measurement data
- Engraved serial number on a stainless steel plate
- Impedance independent output power of 300 Watts RMS per channel
- 4, 2 and 1 Ohms stable
- Processor and temperature controlled fan in bottom plate
- Massive heat sink made of a special aluminum alloy for optimum cooling of all power transistors
Technical data
| Output power RMS | |
| – @ 4 Ohms | 4 x 300 Watts |
| – @ 2 Ohms | 4 x 300 Watts |
| – @ 1 Ohm | 4 x 300 Watts |
| – bridged @ 4 Ohms | 2 x 600 Watts |
| – bridged @ 2 Ohms | 2 x 600 Watts |
| Amplifier technology | Class AB |
| Inputs | 4 x Cinch 2 x Optical SPDIF (32 – 96 kHz) 2 x Coaxial SPDIF (32 – 192 kHz) 1 x Remote In |
| Input sensitivity | RCA / Cinch 1.0 – 8.0 Volts |
| Input impedance RCA / Cinch | 10 kOhms |
| Input impedance highlevel | – |
| Outputs | 4 x Speaker output |
| Output voltage RCA / Cinch | – |
| Signal converter for digital input | BurrBrown 24 Bit DA converter |
| Frequency response | 10 Hz – 80 kHz |
| Bass boost | – |
| Highpass | – |
| Lowpass | – |
| Bandpass | – |
| Subsonic | – |
| Phase | – |
| Slope high- / lowpass | – |
| Slope subsonic / lowpass | – |
| Signal-to-noise ratio digital input | > 116 dB (A-weighted) |
| Signal-to-noise ratio analog input | > 116 dB (A-weighted) |
| Distortion (THD) | < 0.0005 % |
| Damping factor | > 1400 |
| Operating voltage | 9 – 16 Volts (max. 5 sec. down to 6 Volts) |
| Idle current | 8.5 A |
| Operating temperature range | -40 °C to +70 °C |
| Fuse | 6 x 25 A LP-Mini-fuse (APS) |
| Additional features | Colour Protection System, BRAX Power Stabilizer connector, Start-Stop capability |
| Dimensions (H x W x D) | 79 x 360 x 360 mm / |
| Net weight | 12.0 kg |
