We previously discussed the Louder Raspberry Pi, an open-source media center featuring a 25W TAS5805M Class-D amplifier-based Louder Raspberry Hat. The developer has now released the Louder Raspberry Hat Plus, which upgrades to the TAS5825M amplifier, offering up to 53W in mono (PBTL) mode with enhanced efficiency and thermal performance.
The Louder Raspberry Hat Plus is compatible with all Raspberry Pi models and is available in 1X and 2X versions. The 1X version provides up to 2×32W at 8Ω or 2×45W at 4Ω. The 2X version supports 2×32W plus a dedicated 53W subwoofer channel, with a bridge mode for higher mono output.
The board features a DSP with a 15-band parametric EQ per channel, 128-tap FIR filtering, 3-band DRC, selectable LF/HF crossovers, digital volume and gain control (32-step analog gain), selectable modulation schemes, adjustable switching frequencies up to 768kHz, and hardware fault monitoring for various conditions. It can be powered from a 7V–26V external power source and includes a step-down regulator to supply 5V to the Raspberry Pi. It’s suitable for DIY audio systems, smart home setups, multi-room streaming, and embedded audio products.
Key specifications include:
– Compatibility with Raspberry Pi 2, 3, 4, 5, Zero, and others with 40-pin headers
– Texas Instruments TAS5825M I2S DAC with integrated Class-D amplifier
– Output power: 2x 32W (8Ω) or 2x 45W (4Ω) at 20V, 1x 53W (4Ω) in PBTL mode, and 2x 32W (8Ω) + 1x 53W (4Ω) subwoofer for the 2.1 Channel 2X model
– DSP with digital volume/gain control, 15-band parametric EQ, 128-tap FIR filter, and various smart audio enhancements
– Connectivity via a 40-pin GPIO header, including I2S for audio and I2C for control and configuration
– Power features include a 7V to 26V DC supply, onboard buck regulator, and multiple safety features
– Dimensions: 65 x 56 x 20 mm
Since the TI TAS5825M DAC+ AMP isn’t natively supported by the standard Raspberry Pi OS, it requires a custom driver from the project’s repository, which also provides setup instructions. This installation usually takes about five minutes and a single reboot to enable ALSA control over volume and DSP functions. The board works with platforms such as Volumio, Moode Audio, and LMS after configuration, as detailed on Hackaday.
Related products by Sonocotta include the HiFi-Amped and ESParagus Media Center, both featuring advanced audio capabilities. The Louder Raspberry Hat Plus is available on Tindie for $25 (1X) or $30 (2X), with optional add-ons like OLED/TFT display HATs and a 65W power adapter. The board is also listed on Elecrow, although availability may vary.
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