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A Purifi 1ET6525SA at US$1,150 is a very solid ask: VTV’s own stereo build starts at US$1,150, while its monoblock version is listed from US$1,659. That makes this price fair to slightly attractive for a used unit, not a steal, but clearly in the right zone if the listing is complete and clean.
What makes it worth a look is the module itself: the 1ET6525SA is the newer EIGENTAKT generation, known for extremely low noise and distortion, high efficiency, and roughly 230W/8Ω, 480W/4Ω, and 510W/2Ω capability. If the seller is the original owner and includes the case, PSU, and trigger/I/O parts, it’s a smart buy for someone wanting a very transparent, modern amp without paying new-build money.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Purifi Audio emerged from Denmark around 2017 as a research-driven venture founded by audio engineering luminaries Lars Risbo and Bruno Putzeys. Both pioneers in class D amplification—Risbo with his PCM-PWM innovations via Toccata Technology and Putzeys with his storied career—teamed up to push boundaries in distortion reduction. Rooted in the science-centric ethos of the Technical University of Denmark, the company formalized through subsidiaries like Purifi Transducer Technology, emphasizing fundamental R&D over consumer products.
The brand specializes in high-performance components rather than complete systems, focusing on advanced loudspeaker drivers and class D amplifier modules. Their Eigentakt control scheme powers modules like the 400W unit, achieving THD and IMD below -115dB across frequencies. These transducer and amp technologies target measurable excellence in linearity and efficiency, serving OEMs and DIY enthusiasts who integrate them into custom high-end builds.
Purifi occupies a niche boutique position in the high-end hi-fi market, revered by knowledgeable buyers for its uncompromising engineering and objective performance metrics. As a young Danish startup, it earns acclaim for revolutionizing driver and amplification tech, though it remains under the radar outside specialist circles, prioritizing innovation over mass-market presence.
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