IRS2092 Class D Mono Amplifier – 380W RMS of Uncompromising Power
Building a serious subwoofer and tired of exaggerated power ratings? This IRS2092-based Class D mono amplifier board delivers a genuine 380W RMS at 4 ohms with distortion levels below 0.1%. This isn’t peak marketing fluff—it is real, measurable power. With an efficiency rating of over 90%, you get maximum output without wasting energy as excess heat.
Note: This product is supplied as a kit (electronic board only, no chassis included). A dual ±58V–±70V DC power supply is required and must be purchased separately. If your audio source output is below 1.5V RMS, we recommend adding a preamplifier to the signal chain.
Why choose this model? (Key Advantages):
- Verified Real Power — 380W RMS at 4 ohms and 280W RMS at 8 ohms, measured at <0.1% THD, not at the point of clipping.
- ≥90% Efficiency — Unlike traditional Class AB amps that lose 40-50% of energy as heat, this board stays cool under pressure.
- <0.1% THD — High-fidelity sound reproduction that remains true to the source without audible colouration.
- Infineon IRS2092 Chipset — A professional-grade full-bridge driver renowned in the DIY audio community for its reliability and precision.
- Triple Protection Circuitry — Integrated safeguards against short circuits, DC bias, and overheating (100°C), protecting your valuable drivers from wiring mishaps.
- 90dB SNR — Experience crystal-clear audio with minimal background noise, even at lower volumes.
- 20Hz–20kHz Frequency Response — Covers the full audible spectrum, making it versatile enough for full-range mono applications, not just subwoofers.
Performance and Technical Details
At the heart of this board is the Infineon IRS2092, a dedicated driver for full-bridge Class D topologies. It is the preferred choice for DIY enthusiasts who demand precise switching control and constant linearity across the entire frequency range. When paired with a ±65V DC dual power supply and a 4-ohm load, the amplifier reaches 500W peak (10% THD) and a solid 380W RMS under normal operating conditions. With a fixed gain of 36x and an input sensitivity of 1.5V RMS, it integrates seamlessly with standard DACs, mixers, and line-level audio sources.
| Parameter | Value / Detail |
|---|---|
| Amplifier Type | Mono, Class D, Full-Bridge |
| Main IC | IRS2092 (Infineon) |
| Power Supply Voltage | Dual DC ±58V – ±70V (±65V recommended) |
| Peak Power Output | 500W (4 ohm, ±65V, 10% THD) |
| RMS Power (THD <0.1%) | 380W @ 4 ohm / 280W @ 8 ohm |
| Efficiency | ≥ 90% |
| Total Harmonic Distortion (THD) | < 0.1% |
| Signal-to-Noise Ratio (SNR) | 90 dB |
| Frequency Response | 20 Hz – 20 kHz |
| Input Sensitivity | 1.5V RMS |
| Gain | 36x |
| Compatible Impedance | 4 – 8 ohm |
| Integrated Protections | Short circuit, DC bias, Overheat (>100°C) |
Usage Instructions and Safety Precautions
- Carefully verify polarity and wiring before connecting the power supply; incorrect polarity can cause permanent damage to the board.
- Use only a dual ±58V–±70V DC power supply; never exceed ±70V.
- Connect to speakers or subwoofers with an impedance of 4–8 ohms. For subwoofer applications, 10-18 inch drivers are ideal.
- If your audio source outputs less than 1.5V RMS, use a preamplifier to achieve optimal input sensitivity.
- Install a heatsink on the power transistors before initial power-up. While thermal protection is included, proper heat management significantly extends component lifespan.
- Test protection circuits (short circuit, DC) before connecting high-end speakers.
Package Contents
- 1 x 500W IRS2092 Class D Mono Digital Amplifier Board
Frequently Asked Questions
What power supply do I need for this amplifier?
A symmetrical dual ±58V–±70V DC power supply is required. We recommend ±65V for optimal performance. Please note this is not included and must be purchased separately.
Can I use this with 8-ohm speakers, or is it only for subwoofers?
Yes, it works perfectly with 8-ohm speakers, delivering 280W RMS at <0.1% THD. It functions as a full-range mono amplifier and is not restricted to subwoofer use.
Is a heatsink mandatory?
Yes. The board does not include a heatsink. The 100°C thermal protection is a safety feature, not a cooling system. Please mount an appropriate heatsink to match your power requirements.
Can I connect a DAC or sound card directly?
Yes, provided the output exceeds 1.5V RMS. Most desktop DACs output 2V RMS and are fully compatible. If you are using a portable DAC or a low-output source, we recommend adding a preamplifier.
What happens if I accidentally short-circuit the output?
The integrated short-circuit protection will automatically decouple the output to prevent damage. While the board is protected against accidental shorts, avoid testing this feature repeatedly as it is not designed for continuous stress.
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