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This is an ambitious ask: at £466, it sits well above the £367 75th percentile for recent used sales, so it looks pricey rather than a sleeper deal. For a box-opened unit, that premium only makes sense if it’s essentially as-new with complete packaging, documentation, and any original leads or extras.
The appeal is real: the K9 Pro ESS is a highly regarded all-in-one desktop DAC/amp with plenty of power, clean decoding, and enough headroom to suit demanding headphones without fuss. If the unit is genuinely pristine and the seller includes everything, it can still be a solid long-term buy, but buyers should be aiming for a noticeably lower figure to make the value proposition click.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Fiio, founded in 2007 in Guangzhou, China, emerged as a specialist in portable audio gear, initially crafting components like speakers for brands such as Meizu before launching its own lineup. The name blends "Fi" from hi-fi fidelity with "iO" symbolizing digital one's and zeros, evoking authentic sound and modern convenience, while its Chinese rendering "飞傲" conveys innovative vitality. From modest beginnings, the company expanded into a 15,000-square-meter industrial complex by 2022, solidifying its role as a prolific developer of music-centric electronics.
The brand excels across a broad spectrum of portable and desktop audio categories, with flagship strengths in high-resolution digital audio players (DAPs), USB DACs, portable headphone amplifiers, and in-ear monitors. Its portfolio also encompasses cables, desktop amps, and select speakers, prioritizing versatile, high-performance solutions for on-the-go and home listening without venturing into turntables or large-scale hi-fi systems.
Fiio occupies a commanding mid-tier position in the global audiophile market, renowned for delivering premium sound quality at accessible prices that punch above their weight. Praised by enthusiasts for reliability and value, it appeals to discerning buyers seeking refined portable setups over luxury excess, backed by worldwide distribution and a track record of user-acclaimed innovations.
See all Fiio listings on RADAR.
