Pula Unicrom VS Fosi Audio IM4

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The Pula Unicrom offers a comfortable and well-built shell with clear left/right indicators and a swappable cable featuring a secure 4.4mm connector. It comes in four colors and includes a highly praised magnetic case considered excellent value. The cable itself is noted as one of the nicer options at this price point, though the lack of a USB-C option is a minor drawback.

Sonically, the Unicrom delivers a smooth, slightly bassy, and darkish signature with visceral, thick bass and rich, thick mids. Its upper mids are nice and not overly shouty or sibilant, resulting in a cohesive dynamic driver sound. While it lacks the absolute best detail, imaging, and air, it provides a fun and engaging listen, described as a strong V-shape. Graph comparisons show it shares similarities with the much more expensive Moondrop Dragon and the RT10 Pro, offering that kind of tonality at a significantly lower price. It faces stiff competition around $100, like the RT10 Pro and Letshuoer S08, but holds its own as a competent, colorized option.

Ultimately rated a solid B minus, the Unicrom earns a value star and a strong recommendation as a great all-rounder under $100. It's highlighted as a beautifully executed product with satisfying, rich mids and bass, making it a compelling choice for those seeking an organic, fun sound, especially as a gift. While the lower mid warmth might not suit everyone and detail seekers might prefer sets like the Hexa, the Unicrom stands out as a unique and interesting bassy dynamic driver option at its price.

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Fosi Audio IM4 brings a beryllium-coated single DD in a compact shell with thoughtful venting that behaves almost open-back for comfort during long sessions. Build is surprisingly premium for ~$100: a small, well-finished nozzle that grips tips, a light but durable cable with color-coded channels and a working chin slider, a tidy case, and tuning nozzles (black/gold) plus multiple tips. It’s the kind of fit and finish usually saved for pricier sets.

Tonally, this is an engaging, warm-rich tuning with elevated sub-bass, good texture, and plenty of detail—not a neutral reference. There’s energy in the 2–4 kHz region and a bit of 5–6 kHz bite that can read as “cat-ear” presence, trading strict smoothness for extra soundstage perception and clarity. Versus the many neutral options at this price, IM4 feels more characterful and fun; think closer to sets that use a staged upper-mid/treble contour than to flat targets. Filters/foams or a touch of EQ can gently tame peaks while keeping the lively character.

On the scoreboard: bass 7/10 (clean shelf and punch), mids a touch recessed versus a neutral target, treble lively with agreeable detail, and stage/detail notably good for the class. Overall, a well-built, fun, and slightly audiophile-tuned single-DD that will appeal to listeners who value texture and excitement over strict neutrality—plus rare build quality and extras at this price make it a solid value.

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At $80, the Pula Unicrom (aka “Unic”) is a 10 mm single dynamic IEM that keeps the box basic but surprises with a genuinely nice cable—tight weave, slick hardware, and a stealthy screw-on plug that feels finely machined. The shell finishes can be oddball, the naming is weirder, but in the ears it’s easy to drive and hassle-free; throw on preferred tips and it’s ready to go. Marketing quirks aside, build and usability punch well above the bracket.

Sound is the headline: a wide, relaxed soundstage that floats instruments around the head with real dynamics—swells hit hard, decays fall away cleanly, no shout or sting. Bass is warm and textured without bloat, mids stay clear and focused, and treble sprinkles detail instead of poking holes; it’s the rare “fixer IEM” that flatters rough recordings yet makes orchestral and soundtrack cues feel big. For the money it’s a no-brainer—fun, forgiving, cohesive—proof that a well-tuned single DD can still embarrass busier driver packs in this range.

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Quirky name aside, the Fosi Audio IM4 brings a 10 mm beryllium-coated single dynamic driver with a tuning that reads more cohesive, clean, and neutral than bass-bomber. Music floats with a great soundstage and a velvety midrange, giving smooth-jazz and vintage recordings that “swirling around the head” vibe without getting muddy. Hints suggest a price under $100, which would make this one of the stronger performers in the budget bracket, especially given the unexpectedly premium build.

The shells feel like they were machined from the same stuff as Fosi’s amps—weighty, thick, nearly indestructible metal—with a solid 3.5 mm cable (no 4.4 option noted). Accessories are unusually thoughtful: two tuning nozzles (black = lightly damped; brass = no damping) and three styles of tips. Swap to the brass nozzle and treble detail jumps while bass eases off, which can turn the top end a touch spicy for some; stick with the damped setup for a smoother, “just be good” balance. Add a decent case and, if the rumored price sticks, it’s a high-confidence recommendation in the sub-$100 class.