PURIFI Stereo Front End for 1ET400A / 1ET6525SA

The PURIFI FE01 Stereo Front End for 1ET400A / 1ET6525SA is a compact stereo front-end board designed for straightforward integration, testing and operation of compatible PURIFI EIGENTAKT amplifier modules.

Highlights of the PURIFI FE01

• Stereo front-end board for 1ET400A and 1ET6525SA amplifier modules
• Balanced analog XLR inputs for both channels
• Banana-plug speaker outputs plus solder points for additional speaker connectors
• Low-noise, low-THD pre-gain stage with OPA1612 op amp
• 14.4 dB gain with status LEDs and accessible control headers
• Compact 60 x 146 x 39 mm board weighing 120 g

Product details PURIFI FE01

PURIFI FE01 Stereo front-end board for 1ET400A / 1ET6525SA amplifier modules

The PURIFI FE01 is made for DIY integration and bench testing with PURIFI 1ET400A or 1ET6525SA amplifier modules. It brings the key interface and control functions onto a single stereo board, making it easier to build, evaluate or operate a complete two-channel amplifier setup.

Connectivity is focused on practical amplifier construction. The board provides balanced XLR analog inputs, banana-plug speaker outputs and solder pads for extra speaker connectors, such as SpeakON. It also includes a connector for enabling and disabling operation.

For clean signal handling, the FE01 uses a low-noise and low-THD pre-gain stage with an OPA1612 op amp. Low-noise linear voltage regulators supply the op amps, while status LEDs and pin headers provide access to functions such as I2C and status information.

The board supports supply voltages of ±32 V to ±70 V for VP, 15 V for VDR and ±18 V for VUNREG, with connectors for a shared power supply. The amplifier modules are highly efficient with very low idle losses, but proper thermal design remains essential for sustained high output power.