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What makes this dongle notable is its unusually capable, clean implementation in a genuinely pocketable package. At USD 40, it is a strong bargain: the listing sits well below the comparable-market 25th percentile of USD 87, against a USD 127 median and USD 531 75th percentile.
The M12i combines an ESS ES9281AC DAC with Questyle’s low-noise Current Mode amplification, automatic impedance/gain switching, Apple MFi support, and PCM768/DSD512 playback. It is particularly appealing for IEMs and efficient headphones, where the quiet background and fine detail can shine. The main limitation is modest output for difficult full-size headphones, but that is hardly a concern at this price. Before buying, confirm it powers on, passes audio without crackle, and includes the needed USB-C or Lightning connection; if so, this is an easy recommendation.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
ESS is best known as ESS Technology, a U.S. semiconductor company founded by Forrest Mozer in 1983 as Electronic Speech Systems. It began in California and grew from speech and multimedia chips into a specialist in audio conversion silicon, with its later identity strongly tied to digital audio technology rather than finished consumer hi-fi products.
The company’s core focus is audio DACs and ADCs—especially the SABRE family—used by manufacturers in audio, mobile, automotive, and professional equipment. In hi-fi terms, ESS is not primarily a maker of amplifiers, speakers, turntables, or headphones; instead, it supplies the conversion chips that sit inside many third-party components.
In the market, ESS has a technical, high-performance, component-supplier reputation rather than a consumer brand identity. Among informed audiophiles it is often associated with high-end and upper-mid-tier digital playback, while also being somewhat niche because its name usually appears inside other brands’ products rather than on the front panel. It is a respected engineering brand, but not a vintage collector name in the usual sense.
See all ESS listings on RADAR.
