RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
US$149 is a good buy here: it sits well below the US$225 median and under the US$600 75th percentile for recent comparable listings, so this is priced in the bargain zone rather than merely “fair.” For a DAC from a respected niche audio brand, that leaves room for condition to matter, but the ask itself is attractive.
What makes it interesting is the usual DAC upside: these can be clean, low-risk upgrades if the unit is functioning properly and includes the right PSU, remote, or cables. If the listing is genuinely tidy and tested, this is the sort of price where an enthusiast can buy on value first and worry less about future resale. Only press harder on accessories and output/input functionality if it’s missing the essentials.
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.
