Brax RX2 PRO – Founders Edition – limited, hand-signed EIGENTAKT amplifier
Version: Midnight Blue / Digital input
The Founders Edition is a collector’s version of the REVELATION RX2 PRO, the first BRAX amplifier with digital (Class D) amplification, limited to 888 units worldwide. Technically it is the same amplifier: based on PURIFI’s patented EIGENTAKT technology, adapted with PURIFI for automotive use, and winner of the EISA 2024–2025 “In-Car Amplifier” award.
What sets it apart is the finish: an anodised heatsink in Midnight Blue or Black, a mirror-polished stainless steel nameplate with gold laser engraving, a bottom plate hand-signed by Julian Fischer and a certificate hand-signed by Heinz and Julian Fischer. Under the skin it offers multi-stage feedback, a damping factor above 10,000, a load-independent response to 60 kHz and a regulated, start-stop-capable power supply, with the choice of an analog or digital input module.
Key Features
- Limited Founders Edition: 888 units worldwide; anodised heatsink, mirror-polished stainless steel nameplate with gold laser engraving, bottom plate hand-signed by Julian Fischer.
- PURIFI EIGENTAKT Class D: Proprietary bridgeable Class D amplifier based on PURIFI’s patented EIGENTAKT technology, developed with PURIFI as its first automotive-grade version.
- Multi-stage feedback: Several broadband feedback loops correct non-linearities in the power section, including the LC output filter and output relays.
- Load-independent response: Frequency response stays linear up to 60 kHz regardless of speaker impedance.
- Damping factor above 10,000: At 4 ohms, held across the entire audio band rather than only at 1 kHz.
- Modular inputs: Choice of analog or digital stereo input module.
- Regulated power supply: Constant voltage to the power stages independent of battery voltage; start-stop capable and suitable for on-board voltages up to 18 V, e.g. in electric vehicles.
- 67 electrolytic capacitors: Large total capacitance for high impulse currents.
- 8-layer PCB: Low-impedance board isolating sensitive input signals from the power stages.
- Compact format: Same footprint as the BRAX DSP, nearly 40 % more compact than the GX2000 and 66 % smaller than the MX4 PRO, with low heat generation.
- Protection and cooling: Protection circuits for amplifier and speakers, processor- and temperature-controlled fan, heatsink of special aluminium alloy.
- Power Stabilizer connector: Separate input for the BRAX Power Stabilizer.
Inputs & Outputs
- Analog version: 2 × RCA inputs, sensitivity 1.0–8.0 V, input impedance 4 kOhm; “super-balanced” differential input stage per channel with two TI/BurrBrown OPA1612 op-amps for very high common-mode rejection.
- Digital version: optical and coaxial SPDIF inputs, ESS ES9039Q2M DAC with a dedicated dual voltage regulator per channel; DiSAC 2.0 volume control via the BRAX DSP.
- 1 × Remote In, 1 × Power Stabilizer input, input mode switch.
- 2 × speaker outputs.
Power & Amplifier Section
- RMS power (≤1 % THD+N): 2 × 300 W at 4 ohms, 2 × 510 W at 2 ohms, 1 × 930 W bridged at 4 ohms.
- Frequency response 10 Hz – 60 kHz.
- Analog input: SNR above 125 dB (A-weighted), THD below 0.0002 %.
- Digital module DAC: stated 130 dB SNR and -117 dB (0.00014 %) distortion.
- Damping factor above 10,000.
- Operating voltage 9–18 V (for max. 5 s down to 6 V), idle current 1.5 A, max. 150 A at 12 V DC.
DSP & Sound Tuning
The RX2 PRO has no on-board crossovers, EQ or bass boost; it is designed to be driven by a processor. With the digital input module it supports DiSAC 2.0, the BRAX DSP’s proprietary protocol for lossless volume control, managed by the BRAX DSP.
Installation & Connectivity Notes
- Fusing: 4 × 25 A LP-Mini (APS).
- Operating temperature -20 °C to +70 °C.
- Dimensions (H × W × D): 56 × 310 × 200 mm; net weight 4.0 kg.
- Supplied with an Audio Precision measurement report and a certificate hand-signed by Heinz & Julian Fischer.
- Versions: Black or Midnight Blue, each with analog or digital input module.
Technical Specifications
| Power RMS ≤ 1% THD+N | RX2 PRO with analog input module |
| – @ 4 Ohms | 2 x 300 Watts |
| – @ 2 Ohms | 2 x 510 Watts |
| – @ 1 Ohm | – |
| – bridged @ 4 Ohms | 1 x 930 Watts |
| – bridged @ 2 Ohms | – |
| Amplifier technology | PURIFIs “EIGENTAKT” Class D |
| Inputs | 2 x RCA / Cinch 1 x Remote In 1 x Power Stabilizer Input |
| Input sensitivity | RCA / Cinch 1.0 – 8.0 Volts |
| Input impedance RCA / Cinch | 4 kOhms |
| Input impedance highlevel | – |
| Outputs | 2 x Speaker output |
| Output voltage RCA / Cinch | – |
| Signal converter for digital input | – |
| OpAmp analog input | TI / BurrBrown OPA1612 with SoundPlus technology |
| Frequency response | 10 Hz – 60 kHz |
| Bass boost | – |
| Highpass | – |
| Lowpass | – |
| Bandpass | – |
| Subsonic | – |
| Phase | – |
| Slope high- / lowpass | – |
| Slope subsonic / lowpass | – |
| Signal-to-noise ratio digital input | – |
| Signal-to-noise ratio analog input | > 125 dB (A-weighted) |
| Distortion (THD) | < 0.0002 % |
| Damping factor | > 10,000 |
| Operating voltage | 9 – 18 Volts (max. 5 sec. down to 6 Volts) |
| Idle current | 1.5 A |
| Power rating | DC 12 V ⎓ 150 A max. |
| Fuse | 4 x 25 A LP-Mini-fuse (APS) |
| Operating temperature range | -20 °C to +70 °C |
| Additional features | Based on Purif’s EIGENTAKT technology, BRAX Power Stabilizer connector, Start-Stop capability, input mode switch |
| Dimensions (H x W x D) | 56 x 310 x 200 mm / 2.21 x 12.21 x 7.87″ |
| Net weight | 4.0 kg |
Scope of Delivery
1 x High-End Amplifier BRAX REVELATION RX2 PRO – Founders Edition, hand-signed by Julian Fischer
1 x BRAX REVELATION T-shirt
3 x Allen key
1 x Hand-signed certificate by Heinz & Julian Fischer
1 x Audio Precision measurement report
1 x Instruction manual
