Softears RSV MK II VS Letshuoer S12 Ultra

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Softears RSV MK2 takes the original’s idea and pushes it into a bolder, bass-centric direction. The compact shell is comfortably contoured, isolates well, and uses a slightly recessed 2-pin; the angular faceplate gives off an “evil Voltron” vibe in the best way. Packaging and accessories feel premium—a silky cable terminated in 4.4 mm with a matching 3.5 mm adapter, tip selection, cleaning tools—though the bundled case looks nice while feeling a bit faux-leather and questionable for durability. Under the hood is a 5-BA array around the ~$700 mark, presented with the fit and finish expected at this tier.

The tuning is unabashedly bass-heavy with a warmer rise through ~150–200 Hz and a slightly dark-leaning top end; not super airy, but undeniably full, rich, and musical. That weight can introduce occasional roughness/sibilance in certain vocals and can muddy spoken-word content, so this isn’t for everyone. Within Softears’ catalog it stands out: far more low-end than RSV (OG), Volume S, Twilight or Studio 4, and a different philosophy than Enigma’s vivid upper-mids. Versus sets like Monarch MK4, this goes for a deeper, thumpier shelf with a gentler upper air—trading a bit of “technical” sheen for tonal density and groove.

As a “tactfully executed bass-head” Softears, RSV MK2 delivers: impactful low end, natural mids, comfortable build, and a coherent, down-sloping balance that suits modern music exceptionally well. It isn’t flawless—moments of aggressiveness, plus a case that feels more pretty than tough—but the overall package is compelling. In the $400–$900 bracket it scores a 9.4 on this scale, while strong lower-priced options (e.g., bass-shelf specialists like Punch-tuned sets) may satisfy similar cravings if budget leads. For listeners craving a plush, powerful low end done with intent, this is a distinctive and deeply enjoyable take from Softears.

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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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Softears RSV MK2 shifts from the OG’s vocal-centric tilt into a bass-forward all-rounder. The sub-bass and mid-bass hit with real slam and weight, giving drums and bass guitars a satisfying, dynamic punch. Upper mids (3–6 kHz) are tamed to avoid shout, while a gentle 1–2 kHz rise keeps vocals open and natural—slightly less pushed than the original but still clear. Treble is smooth with decent air; not super sparkly and there’s no EST “sauce,” but it stays clean and non-fatiguing.

As a package, MK2’s standout is the low-end texture—thunderous yet controlled—making it one of the more engaging bassy sets under four figures. Technical performance is solid for the tier, though some rivals at lower prices bring more raw detail and EST extension. Build and accessories get a tasteful, modern refresh. For best balance, the stock tips work well; bass-boosting or treble-opening tips can shift it toward a more V-shape at the expense of overall smoothness.

On genre fit, MK2 shines with hip-hop, pop, EDM, and R&B, where its punch and warmth bring rhythms to life; for orchestral or leaner acoustic picks, the bass can edge forward depending on the mix. It scales to mid–high volumes nicely (around the 70–80 dB zone) without turning sharp. Compared with the OG RSV—now likely affected by a silent retune in recent units—the MK2 is the safer buy: less shout, more authority down low, and a broader all-rounder appeal. Recommended, especially if found below full MSRP, for listeners craving tasteful bass with natural mids and relaxed, smooth treble.

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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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The Softears RSV MK II is a 5BA set at $699 with a sleek, performance-driven look—carbon-fiber “V” and RS badge on the faceplate—paired to an ergonomic shell and fish-mouth nozzle that stays light and exceptionally comfortable over long sessions. The package is solid: a braided 4.4 cable (plus a 3.5 mm dongle), cleaning cloth, two pouches, and two sets of silicone tips; the only nitpick is wishing for a more premium carrying case at this price.

What sets RSV MK II apart is how a generous bass boost/extension coexists with top-tier imaging, separation, and layering. In Valorant, footsteps hit with extra energy and impact yet subtle cues—water steps, micro-movements—cut through even during Vandal spam and 5v5 ability chaos. In Battlefield the set is a standout for immersion (planes, tanks) while preserving precise gunfire placement and the light “clinks” that win fights. The latest mix in Apex plays to its strengths: thermites don’t mask light taps, elevation cues remain clear, slides and shield pops are easy to track; and in Call of Duty, airstrikes and mortar fire don’t swamp critical information. It’s scored as the lowest-priced S-tier on the WallHack-certified list—note the tonality skews a touch dark, so strict reference seekers may prefer something lighter, but for impactful low-end plus elite competitive clarity, RSV MK II is a killer pick.

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Softears RSV MK II brings back the all-BA ethos at $700 with five armatures and a promise of “re-engineered BA bass.” Build and accessories feel premium (sleek shells, plush case), while the cable choice is quirky—4.4 mm only with a 3.5 mm pigtail. Fit is outstandingly secure and custom-like but on the larger side with a longer nozzle, so comfort depends on ear size. Softears’ Ultra Clear tips work well; the new metal-ring variant adds little beyond novelty.

On the graph, bass looks like gigabass, yet in ear it settles into a warm, weighty foundation without steamrolling the mids. The midrange follows a “new-meta neutral” tilt—fuller than Harman with forward upper-mids—while treble lands clean and sparkly without fatigue. Imaging is tidy rather than cavernous; separation and delineation are convincing, with the top end executed better than the bottom. BA bass here is among the more physical and satisfying of its kind, though tactility can be track-dependent and turn a bit tubby on very bass-heavy mixes.

Against peers, Symphonium Meteor sounds warmer and more “special” but less all-round; DUNU SA6 MK2 is more colored with janglier treble and the least convincing bass; 7th Acoustics Supernova trades warmth for vivid, bright-tilted imaging; Softears Studio 4 is lighter on bass and airier; and the old Moondrop S8 stays the lively, vocal-centric counterpoint. Net take: a supremely competent, character-light all-rounder that favors bass weight over panoramic staging. Verdict: 4/5 stars—a welcome throwback done right, and notably cheaper than the original RSV launch price.

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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.