Brax RX2 PRO – 2-channel EIGENTAKT Class D high-end amplifier
Version: Silver / Analog input
The REVELATION RX2 PRO is the first digital (Class D) amplifier under the BRAX brand. Developed over more than three years in close collaboration with the Danish company PURIFI, it is based on PURIFI’s patented EIGENTAKT technology, which Audiotec Fischer presents as at least the equal of BRAX’s analog high-end amplifiers. At its market launch it received the EISA Award 2024–2025 as best “In-Car Amplifier”.
Its special qualities come from the multi-stage feedback, which also corrects the LC output filter and output relays, a frequency-independent damping factor above 10,000 and a frequency response that stays linear up to 60 kHz into any load. A regulated, start-stop-capable power supply with 67 electrolytic capacitors keeps the output stages independent of battery voltage, all in a chassis the size of a BRAX DSP. The amplifier is offered with either an analog or a digital input module.
Key Features
- 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.
- Stainless steel nameplate: Engraved serial number.
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 certificate.
- Versions: black or silver, 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
1 x BRAX REVELATION T-shirt
3 x Allen key
1 x Certificate
1 x Audio Precision measurement report
1 x Instruction manual
