RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
At US$1,600, this is clearly ambitious versus the recent used market: it sits well above the US$743 75th percentile and far over the US$238 median. That does not make it automatically bad, but it does mean the seller is asking premium money and should be offering premium proof.
What makes it worth considering is the scale of the piece: a 9-channel audiophile home-theater amp can be a strong fit for a serious surround setup, especially if it’s clean, complete, and has a solid service history. The upside here is convenience and channel count in one chassis, but at this price the buyer should want extras that matter — original packaging, verified function on all channels, and ideally clear history on ownership and use.
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.
