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Audiophonics hpa-s400et stereo eindversterker in uitstekende staat, af fabriek geleverd met de sparkos labs ss3602 discrete opamps. Een serieuze high-end versterker voor wie het maximale uit zijn set
Compared with the obvious alternative of waiting for a cleaner example closer to the middle of the market, this asking price is good value: at €1,000, it sits below the €1,059 median and inside the lower half of recent comps, only modestly above the €982 25th percentile. That makes it more of a sensible buy than a stretched ask, especially for a Purifi-based amp with upgraded op-amps.
What makes it appealing is the core platform: Purifi’s HPA-S400ET is well regarded for very low distortion, high control, and a neutral, effortless presentation, so you are buying into genuinely serious amplification rather than hype. The Sparkos Labs op-amp swap adds some extra enthusiast appeal if the work was done cleanly, and at this price the upside is strongest if the unit is complete and in tidy condition.
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.
See all Purifi Audio listings on RADAR.
