Description BRAX MX4 PRO The Pinnacle of Car Audio Amplification Is it possible to make the best car audio amplifier in the world even better? That was the challenge faced by our engineers during the development of the MX4 PRO. At BRAX, excellence lies in the relentless pursuit of perfection—every component, no matter how small, is re-evaluated and optimized. The MX4 PRO redefines benchmarks in car audio. It combines cutting-edge technology with BRAX's signature heritage and craftsmanship. Each amplifier is custom-made to order, bearing a unique engraved serial number and backed by precision German engineering. Key Highlights Manual selection of power transistors ensures ultra-low tolerances and unmatched performance. A completely revised quad-layer PCB guarantees maximum current flow and power output. 4 x 300 Watts RMS at 4 / 2 / 1 Ohm—independent of impedance. High-efficiency toroidal transformers provide over 1,800 watts of power supply output. Unique DiSAC (Digital Signal Analog Controlled) volume control in conjunction with BRAX DSP. Features Two SPDIF Digital Inputs: Optical and coaxial (up to 192 kHz). DiSAC Technology: Volume control occurs just before the output stage in analog domain for maximum fidelity. Optimized PCB Design: Quad-layer for high current flow. Gold-Plated Relay Switching: For seamless and lossless signal path control. Ultra-High Damping Factor: Over 1,400 @ 4 Ohms for precise speaker control. Dedicated Power Supply Per Channel Pair: Ensures optimal conditions. 40,000 µF ESR Electrolytic Capacitors: With 300A suppressor choke for clean power delivery. 32 Hand-Selected MOSFET Transistors: For outstanding performance. Start-Stop Ready: Operates even when voltage drops to 6V during engine start. DiSAC Explained Traditional volume control methods (via source or DSP) can degrade signal resolution at low volumes. DiSAC, unique to BRAX, preserves audio integrity by adjusting volume only in the analog domain—after digital processing and DA conversion. It works seamlessly with the BRAX DSP, using encoded volume information passed through SPDIF. Technical Specifications Output Power RMS: 4 x 300W @ 4, 2, or 1 Ohm 2 x 600W bridged @ 4 or 2 Ohm Technology: Class AB Inputs: 4 x RCA 2 x Optical SPDIF (32 - 96 kHz) 2 x Coaxial SPDIF (32 - 192 kHz) Input Sensitivity (RCA): 1.0 – 8.0 V Input Impedance: RCA - 10 kΩ Digital-to-Analog Conversion: BurrBrown 24-bit Frequency Response: 10 Hz – 80 kHz S/N Ratio: Digital Input: >116 dB (A-weighted) Analog Input: >116 dB (A-weighted) THD: < 0.0005% Damping Factor: >1400 Operating Voltage: 9 – 16V (down to 6V for 5 sec.) Idle Current: 8.5 A Operating Temp: -40°C to +70°C Fuse: 6 x 25A LP-Mini Dimensions (H x W x D): 79 x 360 x 360 mm Net Weight: 12.0 kg Scope of Delivery 1 x BRAX MX4 PRO Amplifier 1 x BRAX MATRIX T-shirt 3 x Allen Keys 1 x Certificate 1 x Hand-Signed Instruction Manual
