Kiwi Ears KE4 VS Letshuoer S12 Ultra

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Build & accessories: understated box, a surprisingly nice cable with a “juicy” feel and flat 2-pin connectors, plus extra filters. The stock tips are the weak link—thin out note weight and feel downright horrific, so a tip swap is recommended. The medium-to-large shell is a highlight: secure fit, comfy nozzle size, and a handsome faceplate that looks premium in ear. Overall ergonomics and finish scream daily-driver friendly.

Sound: impactful, well-judged bass, lively upper mids, and a touch of upper-air jank; for $200 it’s a strong value with a clean, modern JM1-style tuning. Easily the most convincing Kiwi Ears to date: more balanced and natural than Quintet (which pushes upper mids/10 kHz energy), far more sensible than the treble-shouty Forteza, a clear upgrade over budget options like DLS and the tiny, poorly packaged Singolo, and less fatiguing than the bass-and-upper-mid heavy Melody. Against $200 benchmarks, KE4 becomes a new reference—cleaner male vocals and better build than “Chopin,” and a tighter low end plus tidier mids than AFUL Performer 5. Trades blows with Hype 4 at a fraction of the price; those craving a pricier step-up in the same vein can eye HiSenior Mega5EST. Measured verdict: Tier A, 3-star, 8.8 for tone—good imaging, solid soundstage, gamer-friendly, not flawless but genuinely excellent once re-tipped. A handsome, comfortable set that delivers outstanding value for newcomers and gift-givers alike.

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LETSHUOER S12 Ultra wraps up the S12 line with a 14.8 mm planar driver and a familiar metal shell in gunmetal or mocha. The housing is vented, comfy for long sessions, and solidly built with a flat 2-pin interface that grips tips well. The stock package is practical: a soft case, a fair tip spread, a braided cable with swappable 4.4 mm termination, and even a plug-and-play USB-C DAC that performs capably for on-the-go use.

Sonically, this set aims for a mild V-shape with tasteful tweaks that elevate it over prior S12 iterations. There’s a touch more sub-bass than the S12 Pro and a smoother 10 kHz zone, reducing fatigue while keeping upper-treble reach for air. The presentation favors balance over sparkle: detailed without the brittle edge many planars flirt with, and notably non-fatiguing over longer listens. Technical chops are strong for the class—clean, clear, and “planar-fast”—though instrument separation can lag behind pricier hybrids, and the topmost “crispy” sheen is slightly restrained.

On graphs and in practice, S12 Ultra reads as a refined take on modern planars—more bass weight, tidier 4–6 kHz, and better treble behavior than its siblings. Listeners hypersensitive up top may still prefer something like the S15 for a softer treble contour, while those chasing maximal separation may lean to sets like AFUL Performer 7 (with a spicier treble). With the usual planar caveat about unit variance and fit, this edition comes through as the standout of the S12 series: a clean, engaging, and genuinely high-value recommendation under $500.

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Kiwi Ears KE4 plays a warm-leaning, smooth and relaxing set at mid volume with slightly laid-back vocals and a good sense of space. The real trick is volume scaling: turn it up and the upper-mids/treble step forward with more detail without becoming shouty, while the bass grows thumpier and digs deeper. A 1 kHz scoop plus a tasteful ~3 kHz lift (gentler than Harman) keeps vocals extended yet non-fatiguing; the trade-off is vocal power/weight, which stays a touch mild compared to sets like RS5.

Driven by dual dynamic drivers, the KE4’s low end is among the best under $200 for texture, slam, and note weight, making the tuning feel full and grounded. It’s not as razor-quick in transients or as surgical in imaging as certain planars or techy hybrids, but the payoff is a more natural timbre. Treble sits in a balanced pocket—neither splashy nor dark—with none of the plasticky shimmer or planar/PZT glare.

Against peers: Supermix 4 and Quintet (and even the cheaper “Conta”) push more micro-detail and separation; Orchestra Light is the cleanest/most neutral but softer in bass and more complete in vocals. Versus CKLVX and PULA, KE4 trades their airy, sometimes peaky sparkle for a smoother, more grounded presentation and richer bass grip. Compared with Explorer, KE4 offers a clear step up in technicalities and low-end authority, while Explorer stays more intimate. Net: not the new “benchmark” at $200, but as a crank-it-up, musical all-rounder with standout bass and fatigue-free top end, KE4 is an easy favorite.

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The Letshuoer S12 Ultra comes through as the smoothest tuning in the S12 family— a sub-bass boosted all-rounder with quick transients and satisfying rumble that makes pop, hip-hop, and EDM notably fun. Technical performance sits around earlier S12 variants, but treble detail is dialed back a touch versus the OG/Pro in exchange for a more natural timbre and less “planar-bright” edge. It’s the bassiest S12 to date, hitting with better texture, impact, and extension, while keeping imaging crisp enough to stay engaging rather than clinical.

Tuning tweaks tame the upper range: a cut past 1.5 kHz and an 8–15 kHz dip ease shout and sibilance, with air returning via a lift around 15 kHz. Vocals sit a bit pulled back and the treble is the least energetic of the series, which helps long-session comfort—though brighter, heavily produced tracks or songs with little low-end can still sound peaky if pushed. Best results come at ~65–70 dB; tip-roll toward clear or bass-supporting tips to smooth the top and reinforce the lows, while avoiding brightening tips that exaggerate energy.

Versus peers, S12 Ultra feels like a bassier, less shouty take on Supermix 4/Nova and a slightly more V-shaped, punchier alternative to Defiant. It’s not a value monster for sheer detail compared with cheaper planars (T10, F1 Pro, etc.), but the payoff is a presentation that’s more musical, smoother, and easier to live with. For listeners wanting added slam without losing the S12’s speed and airy sense of space, this version offers the most enjoyable balance in the lineup.

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Kiwi Ears KE4 is a $200 hybrid (2DD+2BA) that showcases the so-called “new meta” tuning—more body in the lower mids and a calmer lower treble versus the Harman Target. Packaging is simple: a pocketable case and bespoke silicone tips (usable, though even shorter tips can improve comfort). The cable handles well but feels a bit thin/kinky with heat-shrink earhooks, and the shells look plain, prototype-like. Fit is secure and comfy with a semi-custom shape, albeit a touch thick, so they can protrude from the ear.

Sonically, KE4 delivers a warm, low-contrast midrange that makes vocals sound natural and well-placed, with a pleasant mid-treble “frothiness” adding texture. Bass quantity leans on the mid-bass, but quality is the weak spot—soft/bloomy and a bit poofy, lacking density and punch, which can dull drive on bass-heavy tracks. Imaging is decent, treble is safe and balanced (not sharp or dark), and overall technicalities are respectable without chasing wow-factor.

Against peers: Truthear Hexa mirrors the new-meta mids with tighter, better-controlled bass; AFUL Explorer is more engaging with tighter slam and slightly crisper treble; the Harman-leaning Binary Chopin brings the best bass attack. KE4 is a strong choice for vocal-first listening and a clear example of the new meta, but the bass bloom can hold it back across a broad library. Verdict: a very solid 4/5 stars.

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Kiwi Ears KE4 drops at $199 and comes across as the best-tuned Kiwi Ears yet. Unlike the Orchestra Lite with its sub-bass roll-off or the budget Cadenza that skews a bit dark, this set keeps the sub-bass present and tight. Compared to the Dolce (energetic with more mid-bass) and the Quintet (politer bass, lighter upper-mids/late treble), KE4 adds more slam while smartly tucking the mid-bass so vocals stay clean. It’s a tuning that both looks right on the graph and lines up with real-music listening across hip-hop/R&B, rock, and acoustic cuts.

Low-end tests—808 drops and bass-guitar lines—hit clean and natural, and kick-drum transients keep their body instead of drying out. Female vocals get clarity without mid-bass haze, while male vocals avoid thinning—nicely balanced through the mids. The treble is managed with some late-treble roll-off, avoiding glare while preserving harmonic bite for guitars and cymbals over longer sessions. Net result: no qualifiers, no obvious weak spot, and performance that competes hard at $199. Easy recommendation and a frontrunner for the brand’s lineup to date.

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Kiwi Ears KE4 is a 2DD + 2BA hybrid touting an isobaric subwoofer system and “sub-bass impact and slam.” The reality doesn’t match the brochure: the $200 package feels plain—simple box, basic case, few tips, and a generic 3.5 mm cable—while the tuning comes across as safe to a fault. Marketing promises of kick drum thump and bass guitar presence give way to a presentation that’s competent but uninvolving.

On music, the low end skews mushy rather than tight, transients lack bite, and the overall tone reads flat—the kind of “waiting-room” vibe that prompts a double-check of DSP settings. Even with a strong seal from premium tips, energy and excitement refuse to show up; it’s “fine ingredients, bland dish.” Technicals aren’t a disaster (it’s not unclear), but fun factor feels negative, recalling ultra-neutral sets like Softears Studio 4S that impress more than they engage. Verdict: about a 6/10 (maybe 7/10 on a generous day), with better value found in a cheaper Kiwi alternative at roughly half the price—skip the KE4 if musical thrill is the goal.

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$199 hybrid with 2DD+2BA, the Kiwi Ears KE4 pairs a glossy, translucent faceplate with an ergonomic 3D-printed resin shell for all-day comfort. The stock 3.5 mm cable is light and flexible, the new silicone tips seal well, and spare filters are included. Sonically it follows the diffuse-field “new meta” tuning popularized by sets like Moondrop x Crinacle Dusk, Dunu Da Vinci, and Mega5 EST—but arrives as the most affordable in that crowd. Tonality leans a touch warm with a smooth upper-mid/treble that keeps gunshots from sounding harsh; for music, the presentation feels immersive and lively at the price.

For competitive play, performance varies by title. In Valorant: B, horizontal imaging and depth cues are convincing, and footstep “thumps” pop through clearly, aiding reaction time. In Apex Legends: B–, basic imaging and map awareness are fine, but busy fights expose separation/layering limits and a slight haze to light taps and micro-details. In Call of Duty: C+ (borderline B–), clarity and detail retrieval dip during chaotic moments and the game’s occlusion/breathing effects mask cues more than preferred. Overall, a stylish, comfortable DF-tuned IEM that’s great for music and a solid pick for Valorant, but not the first choice for top-tier Apex/CoD grinders—though it still makes the Wallhack Certified list.