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Against your recent comp set, US$900 is right at the median and exactly in line with the middle of the market for this piece. It is not a bargain, but it is also not ambitious; with the 25th percentile at US$850 and the 75th at US$1,000, this sits squarely in fair-value territory.
That makes it a sensible buy if the unit is clean and fully functional. The 1ET400A is well regarded for its very low noise, high efficiency, and neutral, controlled presentation, so the appeal is straightforward: a serious-sounding power amp in a compact, modern platform. At this price, the main upside is simply getting one in good condition without paying top-of-range money; I’d just want confirmation of provenance, accessories, and that there’s no history of faults or overheating.
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.
