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A pair of these is a real value play at US$70. Against the recent used-market anchor of a US$236 median and a US$92 25th percentile, this is comfortably cheap and reads as a strong bargain rather than a marginal discount.
What makes it interesting is the same thing that has kept QSA pieces in circulation: they’re bought by hobbyists chasing lower noise and a cleaner, more relaxed presentation, and a two-pack gives you practical flexibility across a couple of components. Since it’s a lot of two and the condition is unclear, I’d mainly check that both units match, the amperage rating suits the gear, and there’s no damage to the connectors or housing; otherwise, this is the kind of niche tweak that’s easy to justify at this price.
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.
