SoundImpress DIY Mono amplifier Kit | Powered by Purifi

The PU400-1CH-Kit from SoundImpress is a DIY mono amplifier kit that brings the celebrated performance of Purifi’s Eigentakt™ technology to your own build. Designed for audiophiles and hobbyists who demand reference-level sound, this single-channel kit offers an exceptional foundation for a high-fidelity audio system. Whether you are constructing a dedicated monoblock pair, upgrading an existing stereo setup, or building a custom active speaker, the PU400-1CH-Kit delivers pristine amplification with remarkable efficiency.

At its core, the amplifier employs Purifi’s Eigentakt™ circuit topology, a Class D design that achieves a signal-to-noise ratio of 131 dB and a frequency response from 0 Hz to 60 kHz. This ensures vanishingly low noise and distortion, revealing every nuance in your music. The kit supports a minimum load of 2 ohms and includes a single XLR input, with input impedance options of 4.4 kΩ (14 dB gain) or 10.2 kΩ (27 dB gain) for flexible system integration. Housed in a robust aluminium chassis, the amplifier requires a 110/220 VAC mains supply via an IEC C14 connector and is compatible with banana plug speaker terminals. With an efficiency rating of 1 (indicating excellent power conversion), this kit is a superb choice for those seeking audiophile-grade performance from a hands-on project.