Purifi
A Roskilde audio engineering company whose Eigentakt Class D amplifier modules and Ushindi drivers are built into other makers' amplifiers and speakers.
- Founded by
- Bruno Putzeys, Lars Risbo, Peter Lyngdorf
- Company
- Purifi Audio ApS
- Based in
- Roskilde
Pictures © Purifi Audio ApS, from purifi-audio.com.
Why it is renowned
Purifi's amplifier technology is built into other makers' products. Marantz developed the power stage of its Model 10 amplifier in partnership with Purifi,1 and the German maker T+A builds its Symphonia amplifier on customised versions of Purifi's Eigentakt Class D design.2 The two co-founders set out the company's research into loudspeaker distortion in the trade journal Voice Coil in 2021, republished by audioXpress.3
The story
Purifi was founded by Bruno Putzeys and Lars Risbo, with Peter Lyngdorf, owner of DALI and Steinway Lyngdorf, as co-founder and investor.4 Putzeys had invented the UcD amplifier at Philips and the Ncore amplifier at Hypex; Risbo had founded Toccata Technology, later bought by Texas Instruments, where he became a TI Fellow.43 The company is based in Roskilde.5
Eigentakt, Purifi's patented Class D amplifier topology, is sold as drop-in modules and licensed to other makers as designs.6 Ushindi is its line of drivers from 4 to 8 inches, with the PureDrive motor system and the NeutralSurround suspension, sold as products and as licensed technology.7
Works
What to know it by
Sources
- Marantz 10 Series, HomeTheaterHifi. hometheaterhifi.com, read 2 October 2026.
- Symphonia, T+A. ta-hifi.de, read 2 October 2026.
- Some Speaker Problems That Needed Solving, audioXpress. audioxpress.com, read 2 October 2026.
- Purifi, About. purifi-audio.com, read 2 October 2026.
- Purifi, Contact us. purifi-audio.com, read 2 October 2026.
- Eigentakt, Purifi. purifi-audio.com, read 2 October 2026.
- Ushindi, Purifi. purifi-audio.com, read 1 October 2026.
Checked 28 September 2026, against the maker's own pages.