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Angeboten wird „Red Sicherung in 10A / 5x20mm / träge“ von QSA als Ausstellungsstück aus der Kategorie „Feinsicherungen“ bei audio-markt.de - dem Online-Marktplatz für High-End. Das Inserat mit der Nummer 7099298353 endet am 14.09.2026 um 06:10 Uhr.
Is €900 a bargain for a QSA Quantum Science Audio product, or just a fair price for a well-regarded optimizer? Without the exact model name, this listing is hard to benchmark against the typical used market, as QSA sells a wide range of high-end fuses and jitter reducers with new prices spanning from roughly €71 for entry-level light blue fuses to over €8,450 for the LAN Jitter GOLD. If this is a mid-tier fuse or a compact optimization device, €900 likely sits near the median or even above typical used values; if it’s a higher-end unit like a Violet IEC or similar, the price could be fair depending on condition and included accessories.
What makes any QSA product worthwhile is its reputation for tangible improvements in noise reduction, timing accuracy, and system stability in high-end audio setups. Buyers should verify the specific model, confirm it’s in original-owner condition with no physical damage, and check for included mounting hardware or documentation. If the unit is a known performer like the Violet or Blue series and the listing is clean, €900 could represent a solid opportunity—especially if new equivalents cost significantly more. Only raise concerns if the model is obscure, accessories are missing, or there’s evidence of age-related wear, since QSA’s core value lies in long-term reliability and measurable sonic gains.
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.
