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At A$1,995, this sits well above the recent used-listing median of A$711 and also above the 75th percentile at A$1,580, so it reads as an ambitious ask rather than a bargain. That doesn’t make it unreasonable on its face for a serious tube phono/preamp with remote and MM/MC flexibility, but it is priced at the premium end of the local used market and should be judged against current new or near-new alternatives as much as against ordinary secondhand gear.
The appeal here is straightforward: Quantum Science Audio pieces are aimed at enthusiasts who want a more refined, valve-flavoured presentation, and a good phono stage with both MM and MC support can be a very useful, long-term part of a vinyl system. If it’s complete, quiet, and genuinely well cared for, the upside is getting a high-spec, feature-rich front end without paying full retail. At this price, I’d want original power supply, remote, and clear confirmation it’s performing properly with both cartridge types.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Quantum Science Audio (QSA) emerged in early 2020 under the leadership of Steven Tsang, an electronic engineering expert with deep roots in audio consulting. Based in Scottsdale, Arizona, with ties to Hong Kong where Tsang honed his expertise, the brand quickly carved a niche through relentless innovation in power components. Drawing from over two decades of proprietary research, QSA embodies a fusion of technical discipline and audio obsession, prioritizing subtle yet profound system enhancements.
The company's focus centers on high-performance aftermarket fuses, including thermal, slow-blow, automotive, and specialized AC variants like inlets, outlets, and panel breakers. QSA also extends into power receptacles and related accessories, all engineered to eliminate so-called "bottlenecks" in signal paths. Their lineup spans accessible entry points at around $28 to ultra-premium models commanding exorbitant prices, reflecting escalating tiers of advanced materials and quantum-inspired treatments.
In the hi-fi market, QSA occupies a polarizing boutique position among high-end enthusiasts, celebrated by some for transformative sound improvements in power delivery. Top models attract audiophiles chasing marginal gains, though skeptics dismiss the claims as overreach amid long production lead times. This niche status suits discerning buyers open to experimental upgrades in an otherwise crowded field.
See all Quantum Science Audio listings on RADAR.
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