Simgot Supermix 4 VS Letshuoer S12 Ultra

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SIMGOT Supermix 4 comes out swinging: a quad-brid with both planar and PZT drivers that somehow sounds buttery smooth and shockingly coherent—more like a single driver than a parts bin. Upper-mids and treble sit neutral and refined, avoiding the usual glare; tuning reads as Harman 2019 done right—what feels like endgame Harman. Versus sets like Supernova/Nova/Chopin, the SM4 brings cleaner extension, higher resolving power, and a smoother, more polished treble where cymbals and consonants land naturally. Note this is a pre-production unit, so final tuning may still shift.

Bass quantity measures lower than some peers, but that puts the low end in the background and boosts separation, layering, and transient clarity; texture is tidy, impact respectable, and decay well-judged. Vocals are a highlight—accurate, balanced, complete in extension, and consistently non-fatiguing. Treble adds a sprinkle of liveliness without turning sharp. In A/Bs: it feels like a cleaner, more energetic Origin; a smoother, more technical all-rounder than CK LVX/Pula (though those keep a fuller, dreamier flavor); trades blows with Dusk (Dusk hits harder and runs brighter, SM4 wins mid/upper-mid detail and vocal completeness); and out-separates Hype 4 while Hype 4 remains the bigger, bassier fun pick. As an all-rounder this is top-tier; if priced around Dusk/Hype 4 it’s a strong value, while a ~$500 tag would push it into diminishing returns.

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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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Build and comfort are front-and-center: a cozy shell with a metal faceplate, excellent ergonomics, and easy tip fitment. The red/blue two-pin sockets and the gunmetal cable add a premium touch, while the case is the familiar, functional Simgot pouch. Hype is warranted at least on construction—this is the most comfortable Simgot shell in the lineup so far.

Sonically, Supermix 4 follows a Harman-style curve with clean channel matching, solid resolution, and bass that balances sub-bass presence with controlled mid-bass. Treble can “touch the sun”—slightly bright on certain tracks—and the very low impedance makes it source/tip sensitive; tip rolling and even a basic Apple dongle often settle it down. Technicalities are strong for the price: clarity, shimmer on cymbals, and lifelike guitars impress, though some will crave a smoother top end.

Against peers, it surpasses EW200 in refinement and comfort and feels like a cleaner, easier-to-live-with replacement for EM6L. Compared with AFUL Explorer, this is the more forward/bright take versus Explorer’s laid-back vibe; versus CCA Hydro, vocals are steadier while Hydro punches harder down low. Kiwi Ears Quintet shows similar intent but has quirks around 10 kHz; DaVinci is a touch more refined yet pricier, and some will prefer Supermix 4’s shell and value. Net result: a strong recommendation for listeners wanting a comfortable, versatile, mildly vivid IEM that competes above its bracket—great for music and even gaming—so long as a hint of brightness is acceptable.

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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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The SIMGOT SuperMix 4 pairs a lightweight metal and resin shell, good isolation and a decent cable with a mostly Harman-style, vocal-forward tuning. Bass comes across as clean, clear and reasonably detailed with no bleed into the mids, but slam, rumble and physical impact are noticeably softer than expected, especially compared with the cheaper EA500 LM and other sets on a similar curve. The low end feels slightly below average in attack and weight, so even hip-hop and pop tracks that usually hit hard come across as polite and less engaging.

The midrange is clean and clear with a strong focus on female vocals and upper mids, yet the 3–6 kHz region can easily drift into a shouty or shrill character depending on volume, genre and recording, leading to listening fatigue on K-pop, J-pop, rock and brighter material. Treble is detailed, airy and full of shimmer, but the overall presentation does not feel fully natural or cohesive, becoming harsh when the volume is raised and a bit strange when kept low. Technicalities are strongest in the upper mids and treble, while soundstage size is essentially average for the price range.

In direct comparisons, sets like EA500 LM, Nova, AFUL Explorer and Binary Chopin offer more convincing bass slam, more natural tonality and a more engaging, coherent presentation at similar or even lower prices, making the SuperMix 4 feel more like a sidegrade than a true upgrade around the $150 mark. SuperMix 4 provides slightly higher perceived technicalities in specific upper-mid and treble regions, but this comes at the cost of greater fatigue and a very smooth, almost boring overall character that struggles to excite across diverse genres. For most listeners, alternatives in this segment give better value, leaving SuperMix 4 mainly for brand loyalists who specifically want a cleaner, brighter, vocal-focused take and can tolerate the sharper ear-gain region.

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Supermix 4 emerges as the standout of Simgot’s quartet for both fit and build, pairing a classy brushed bronze faceplate with the most refined tuning of the group. As a quad-brid, it delivers superior cleanliness, imaging, and depth perception versus EM6L, EA1000, and EA500LM, with tighter separation and more micro-detail; its presence region feels a touch more laid-back than EA1000, keeping gunshots from turning shouty. Footsteps could be slightly more elevated for sweaty lobbies, but that’s easily addressed with EQ while preserving the set’s natural balance.

Across titles it’s the most dependable all-rounder: in Valorant, the added cleanliness and precision outclass EA500LM (bloated, spicy gunshots) and nudge ahead of EM6L/EA1000; in Rainbow Six Siege, clarity, separation, and positional cues make it the clear pick. Call of Duty is closer—EA500LM is a solid budget choice and EA1000 can get intense—but Supermix 4 still pulls more footstep detail while staying composed; in Apex Legends it trades blows with EM6L yet edges ahead with extra information retrieval. Overall verdict: Supermix 4 wins, with EM6L in second, EA1000 around B-, and EA500LM around C+; a clean, precise, and thoroughly engaging pick for competitive and casual gaming alike.

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Final revision of the series brings a very coherent, slightly warmer presentation with treble pulled into safer territory and mids that feel a bit weightier. Ultra sits between the smoother S08 and the rawer S12 Pro, and it comes across a touch bassier than the graphs suggest. As a single-driver planar, it retains solid resolve and a natural, easy tonality that will suit most listeners, especially at the 169 price point.

Despite graphs looking similar to S12 2024, Ultra sounds smaller and flatter, with less transparency and dynamics. Soundstage is mainly left-right; height and depth are curtailed, so placement is not always in the right place on more spacious tracks. The smoother top end avoids harshness and makes long sessions comfortable, but the trade-off is reduced sparkle and air versus the 2024 tuning.

Versus budget planar standouts like KZ PRX, Ultra is a clear, smoother upgrade; versus S12 2024, it is the safer all-round pick but not as open or exciting. Dense mixes can nudge the bass toward a slight bloom and compress the center image. For most, this is the one S12 to buy; stage and transparency chasers may still prefer the 2024 version.