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This is a buyer’s market for this amp at US$599: it sits well below the US$728 25th percentile and far under the US$857 median of the recent USD comps, so it reads as a strong deal rather than merely fair. With only three comps, the sample is small, but on the numbers you gave, this is priced aggressively.
The C390DD is well regarded for clean, high-current Class D performance, solid digital integration, and that typical NAD mix of control and ease with real speakers. If the unit is complete and behaving properly, the upside is obvious: you’re getting a respected integrated at a price that leaves room for a checkup or any missing extras. On a used digital amp, I’d still confirm inputs, display, and power-up behavior, but the price leaves healthy margin.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
NAD Electronics was founded in 1972 in London by a group of European audio importers frustrated with the hype surrounding Japanese hi-fi products. Led by visionary American executive Martin L. Borish and brilliant engineer Bjorn Erik Edvardsen, the company emerged from a quest to deliver high-performance audio at accessible prices. Their breakthrough came with the NAD 3020 integrated amplifier, the best-selling hi-fi amp in history, which embodied a philosophy of stripping away non-essentials to prioritize pure sound quality.
The brand focuses on core hi-fi categories, excelling in amplifiers—pioneering Class A/B, Class G, and hybrid digital designs—alongside integrated receivers, AV processors, turntables, CD and cassette players, and modern streamers. While not venturing into speakers, headphones, or cables, NAD emphasizes source components and amplification that integrate seamlessly into home theater and custom installation setups, always upholding principles of innovation, simplicity, performance, and value.
Today, as part of Canada's Lenbrook Group and sold in over 80 countries, NAD holds a commanding mid-tier position in the market, revered by audiophiles for affordable excellence rather than ultra-high-end excess. Its "Truth in Power" legacy earns cult status among knowledgeable buyers seeking reliable, award-winning gear that punches above its price, blending vintage heritage with contemporary streaming and hybrid tech.
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