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US$45 is a strong deal on this one: it sits well below the US$100 25th percentile and far under the US$169 median for recent comparable listings, so this is priced like a bargain rather than a fair-market ask.
The NX4 is a respected portable DAC/amp because it gives a clean, punchy step up from phone or laptop headphone jacks, with enough output for a lot of efficient to moderately demanding headphones and a genuinely travel-friendly form factor. At this price, the main upside is simple: you’re buying a proven, still-useful pocket DAC/amp for very little money, so it’s a sensible grab if it powers up normally and includes the basics you need; if anything is missing, the low ask still leaves room.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Topping Audio, founded in 2008 in China, emerged from a team of dedicated audio engineers committed to democratizing high-fidelity sound. Without a single prominent founder in the spotlight, the brand quickly distinguished itself through rigorous innovation, amassing over 20 patents and pioneering technologies in digital audio processing. This heritage of independent R&D, backed by more than 30 experienced engineers, has positioned Topping as a global Hi-Fi contender focused on precision and accessibility.
The company specializes in desktop and portable audio gear, excelling in digital-to-analog converters (DACs), headphone amplifiers, and power amplifiers. Flagship models like the D90 DAC showcase cutting-edge components, such as the AKM AK4499EQ chip, delivering studio-grade performance. Topping also offers audio interfaces and, under its TOPPING Professional sub-brand, pro-level solutions for demanding studio environments, all emphasizing meticulous testing for reliability and sonic purity.
In the competitive hi-fi market, Topping occupies a mid-tier niche as an audiophile favorite, renowned for punching above its weight with exceptional value. Praised for build quality, intuitive design, and uncompromising transparency at affordable prices, it rivals pricier brands while earning loyal followings on forums and among desktop enthusiasts seeking high-end results without premium markups.
See all Topping Audio listings on RADAR.
