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ONLY 1 LEFT! I have 2 Yellow Jitter mains plugs which are surplus as I have moved over to Euro(Schuko)plugs, so consequently I have a few Yellow 13 amp QSA fuses aswell as the Jitter plugs.
£125 looks like a strong buy: it sits well below the £245 median and above the £48 lower quartile, so this excellent-condition example is comfortably cheaper than the typical used listing.
The Yellow is QSA’s entry-level IEC jitter plug, intended to fit between a power cable and component or distribution block. It has a good enthusiast following for perceived gains in clarity, timing, treble resolution and soundstage, though the effect is system-dependent rather than guaranteed. New UK pricing is around £130 excluding VAT, making £125 used particularly attractive if the correct IEC format, original packaging and clean, firm connections are confirmed. Allow some settling time after installation, but there is no material price-related concern here.
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.
