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New, the K17 was around USD 899–990, so USD 650 is a strong used-market buy. Your six recent sold comparables put the median at USD 236 and the 75th percentile at USD 464; this ask is above those figures, but the K17 is a newer, substantially more capable flagship and deserves separate context rather than a direct comparison with older FiiO units.
Its appeal is the unusually complete package: dual AK4499EX conversion, a powerful discrete balanced amplifier, 31-band PEQ, streaming, Bluetooth LDAC, touchscreen control, and both RCA and XLR outputs. It can serve as DAC, headphone amp, preamp, and streamer in one box, with enough output for demanding headphones. At USD 650, it looks compelling if fully functional and complete with remote and accessories; confirm firmware, screen, network features, and all headphone outputs before buying, since software behavior matters more here than basic sound quality.
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.
