Brax GX2400 – Silver / Long

Brax GX2400 – 4-Channel Class AB High-End Amplifier

Version: Silver / Long

The GX2400 is one of the two current analog power amplifiers in the BRAX range and the successor to the original BRAX X2000/X2400 generation. It is a 4-channel Class AB design, handcrafted in Germany, and intended as a pure power stage for high-end systems where all filtering and tuning are handled upstream by a processor.

BRAX deliberately leaves out crossovers and filter functions in this generation and concentrates on the signal path itself: a carefully laid-out circuit board, short signal routes and hand-picked components. Every output transistor is selected by hand – BRAX sorts transistors into more than 300 categories using measuring equipment developed in-house – so that units do not differ in power. The amplifier is offered in black or silver and with a short or a long (extended) heatsink.

Key Features

• Class AB, 4 channels: 4 x 150 W RMS at 4 Ohms, 4 x 240 W RMS at 2 Ohms, or 2 x 480 W RMS bridged at 4 Ohms.
• 32 hand-selected MOSFETs: high-end MOSFET transistors chosen individually to keep channel and unit-to-unit power consistent.
• Purist signal path: no crossovers, filters, bass boost or phase controls – the amplifier only amplifies.
• High-end input capacitors: premium signal capacitors are used at the signal inputs.
• Powerful power supply: specially developed transformers with high-efficiency core materials, designed for a total output of more than 1,000 W.
• Solid aluminium heatsink: made from a special aluminium alloy and cooling both the power supply and the output stage transistors.
• Gold-plated terminals: solid terminals for power cables up to 50 mm² (gauge 1) and speaker cables up to 6 mm² (gauge 6), for low connection resistance.
• Dedicated IPC terminal: a separate connection links a BRAX IPC capacitor directly to the switching transistors.
• Hidden gain controls: input sensitivity controls sit under the nameplate to keep the top surface clean; range 1.0–8.0 V.
• Excellent measured performance: THD below 0.0008 %, damping factor above 1000, analog SNR above 120 dB (A-weighted).
• Versions: black or silver finish, each with a “Short” or “Long” heatsink.
• Made in Germany: handcrafted by Audiotec Fischer.

Inputs & Outputs

The GX2400 has four RCA (cinch) inputs plus a remote input; input impedance is 10 kOhms and the input sensitivity is adjustable from 1.0 to 8.0 V. There are no high-level (speaker-level) inputs, no digital input and no RCA pre-outs. On the output side it provides four speaker outputs, which can be bridged in pairs for two-channel operation at 4 Ohms.

Power & Amplifier Section

Rated output is 4 x 150 W RMS into 4 Ohms and 4 x 240 W RMS into 2 Ohms; bridged, it delivers 2 x 480 W RMS into 4 Ohms. No 1-Ohm or bridged 2-Ohm ratings are specified. Frequency response extends from 10 Hz to 80 kHz, distortion (THD) is below 0.0008 %, the damping factor exceeds 1000 and the analog signal-to-noise ratio is above 120 dB (A-weighted).

DSP & Sound Tuning

The GX2400 contains no DSP and no analog filters (no high-pass, low-pass, band-pass, subsonic, bass boost or phase adjustment). Crossover and tuning must be done in an upstream processor, which makes it a natural partner for a dedicated high-end DSP in a fully active setup.

Installation & Connectivity Notes

• Operating voltage: 9–16 V, briefly (max. 5 seconds) down to 6 V; start-stop capable.
• Idle current: 3.5 A.
• Fusing: 4 x 30 A LP-Mini fuses (APS) on board.
• Operating temperature: -40 °C to +70 °C.
• Additional features: Colour Protection System and a BRAX Power Stabilizer connector.
• Dimensions (H x W x D): 53 x 237.5 x 433 mm with the short heatsink, 53 x 237.5 x 473 mm with the long heatsink.
• Weight: 8.2 kg (short heatsink) or 8.6 kg (long heatsink).

Technical Specifications

Scope of Delivery

1 x High-End Amplifier BRAX GRAPHIC GX2400
1 x BRAX GRAPHIC T-shirt
3 x Allen key
1 x Instruction manual