The KEFINE Delci is a ~$59-street ($75 list) single 10 mm DLC + PU dynamic-driver IEM in a 5.3 g CNC-aluminium shell with a detachable 2-pin copper cable. Reviewers broadly agree on what it is: a warm U/V-shaped tuning with a large, well-extended sub-bass shelf, a smooth, un-shouty upper midrange (the graphs show only ~6–7 dB of pinna gain), natural timbre, punchy dynamics, precise imaging, an easy-to-drive load, a standout stock cable and an all-metal build that feels well above its price — and near-unanimous value verdicts at ~$59. The disagreements are specific. Treble splits three ways: most hear it as smooth and safe, a real contingent hears a lower-treble (~5–6 kHz) peak that turns spicy or sibilant on hot recordings, and a third camp finds the top rolled-off and short on air — the measurements show both the lift and the roll-off, so which one you notice tracks your ears, tips and insertion depth. Soundstage divides between 'wide and expansive for the class' and 'wide but shallow — a wall of sound' (the depth/layering complaint is the recurring one). Detail is argued between 'better than it should be' and 'average technicalities, not for critical listening', and bass, while loved for quantity and extension, draws repeated notes about soft attack and one-note texture. Comfort is mostly praised — many wear it for hours or sleep in it — but fit is unusually tip-dependent thanks to a short, wide-ish nozzle and mediocre stock tips, and some ears never seal. The non-sonic caveat is reliability: a minority of owners report a side going quiet or dying within months, often traced to the paper nozzle filter wicking moisture (the same story as the Klean); later batches add removable filters and spares.
About this product
The original Delci (March 2024): a single 10 mm DLC + PU composite-diaphragm dynamic driver in a dual-cavity, one-piece CNC-machined aluminium shell — 28 Ω / 108 dB, a featherweight 5.3 g per side — with a detachable 0.78 mm 2-pin 164-core copper cable, 3.5 mm only (no balanced option), two sets of silicone tips and a zippered case. Gunmetal only. Listed at $75–79 but sold at ~$59 for most of its life (Kefine's own Amazon listing sits at $58.50 in 2026). Owners report that 2026 stock ships in the Delci AE-style shell with removable nozzle filters plus spares; the reviews and measurements here are all of the original unit. Not the Kefine x Angel Ears Delci AE (~$90, swappable silver/gold tuning nozzles, brighter), nor the cheaper Klean / Klean SV, the planar Klanar, or the later Loric.
Kefine is a young Dongguan brand with Sivga roots, and the Delci was its second release: a single 10 mm DLC-coated dynamic driver in a one-piece aluminium shell so light — 5.3 g a side — that reviewers kept double-checking the scale. It launched at $79, spent most of its life at $59, and arrived just as the sub-$100 single-driver bracket was crowding up with bright, Harman-ish 'technical' sets.
It zigged instead: big sub-bass, a deliberately restrained upper-midrange, a lower-treble lift and an early roll-off up top. That tuning won it a stack of 'best under $100' verdicts, a blind-buy reputation on Reddit and even an approving nod from Crinacle — and it is exactly what the dissenters argue about: too smooth or too spicy, spacious or boxed-in, resolving for the money or merely average, plus a reliability story that echoes its Klean sibling.
