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Recent comparable sales put the median at £278, with the lower quartile at £59 and the upper quartile at £374. At £200, this is comfortably below the median and looks like a strong buy, particularly with the box opened rather than clearly used heavily.
The K13 R2R is a versatile desktop DAC/headphone amp: its true 24-bit R2R design offers NOS and oversampling modes, while Bluetooth 5.4, USB, optical and coaxial inputs make it unusually adaptable. It also has plenty of headroom for demanding headphones, with especially strong output from the 4.4 mm balanced socket, plus line-level connectivity for a wider system. Before paying, confirm the power supply, remote, cables and balanced outputs are included, but assuming normal working order, £200 is an excellent price rather than merely fair.
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.
