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*US* BUYERS IGNORE MESSAGE ABOVE SAYING THERE IS TARIFFS FOR THE BUYER THAT IS NOT TRUE! I PREPAY ALL US BUYER TARIFFS NO TARIFFS FOR YOU TO PAY, YOU PAY IS ONLY AT CHECKOUT NO HIDDEN FEES*Elevate your audio experience with the NAD 523 5-Disc CD Changer Carousel. A first-generation audiophile's dream, this CD player offers Hi-Fi sound quality and a sleek black design that fits seamlessly into any home audio setup. The unit supports stereo surround sound formats, ensuring a rich and immersive auditory journey.With a capacity to hold five CDs, you can enjoy a diverse music library with ease. The NAD 523 boasts stereo L/R RCA audio outputs for a straightforward connection to your existing sound system. Fresh from a manufacturer warranty of one month, this unit is ready to deliver consistent, high-quality audio performance.
This is a buyer-friendly market for this kind of used CD changer, and this ask of US$263 sits just above the US$238 median but well below the US$705 75th percentile, so it reads as fair rather than cheap or ambitious.
That makes it a reasonable buy if it’s truly fresh serviced and includes the remote, since the appeal here is convenience, solid multi-disc playback, and vintage NAD/related hi-fi practicality for someone who still wants a changer in a main or secondary system. The real upside is a clean, functioning unit with proof of service and smooth tray/laser operation; at this price, age-related wear matters mainly if it undermines that promise, so I’d want confidence in disc loading, track access, and long-term reliability before jumping.
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.
