Letshuoer S12 Pro

Read almost everywhere as a fun, energetic V/U-shape — strong bass, a laid-back midrange, an elevated top — that the rigs confirm: warm through the lower mids, early ear gain, a presence dip, an 8 kHz peak. Where sources differ is on the adjective: 'balanced' and 'natural for a planar' from most, 'fairly bright', 'colder side' and 'too thin and unnatural' from a minority; a 'planar sheen' on acoustic timbre is noted on both sides.

“The S12 Pro are a fun-sounding, yet balanced, V-shaped pair of IEMs.”

baskingshark, Headphonesty

“The S12 is a slightly warm and very enjoyable set of earphones that balances its sound signature between sounding reference and musical while retaining good levels of transparency and technicalities.”

Petros Laskis, Ichos Reviews

“it is still fairly bright in its tonality very good Clarity”

David, Prime Audio Reviews (via YouTube transcript)

The most agreed-on sonic trait after imaging: deep, tight, fast and textured, with the sub-bass reach and control of a planar and none of the bloat. The recurring caveat is physicality — it is a big shelf on the graph but lighter on slam, decay and 'pressure' than a good dynamic driver, and a small camp (Berry108, Faxepremium, the 'not visceral' Reddit thread) calls it light or tame. Foam tips and a weak source thin it further; blocking the vents adds ~3 dB.

“The S12 PRO has fantastic bass quality, with excellent definition, and a very textured presentation.”

Chris, The Headphoneer

“In terms of quality, bass texturing is pillowy and sometimes can sound undefined, but bass speed is lightning fast and can cope with complex bass movements.”

baskingshark, Headphonesty

“The bass is present, well controlled and nicely outlined. Great for fast music. Kick drums stay tight, bass lines do not smear. But I miss some mass, pressure and physical push.”

Faxepremium, via IEMRanking

“Bass of the S12 Pro is light overall.”

Berry108, Head-Fi

Sources split. Three-quarters of the weight hears a clean, clear, textured midrange with enough body — male vocals warm, female vocals crisp — that the Pro's nozzle foam smoothed compared with the original S12. A quarter, including the strongest editorial voices, hears the V-shape's dip: thin, dry, recessed and hollow, female vocals strident or sharp, and 'planar haze' when a track gets busy. Warmer sources and a tip with a deeper seal move listeners from the second camp to the first.

The defining split, and the widest in the record. To just under half the weighted sources the top end is crisp, clear, extended and — the Pro's selling point over the S12 — no longer harsh: 'no sibilance', 'never fatiguing', 'treble-sensitive should be able to tolerate this'. To just over half it is bright 'make no bones about it', sibilant on esses and cymbals, splashy, and tiring over an hour — a 'mountain 8k peak' that owners tape, foam-tip and EQ away, and that one buyer says gave him a tinnitus attack. Two dissenters want MORE (Major HiFi's 'underpowered highs', Headmania's 'darker side'). Tips, insertion depth, source and unit each move the 6–10 kHz region by 3–9 dB, which is why both camps can be reporting honestly.

Widely regarded as class-leading resolution for the money — sharp note definition, planar transparency, micro-detail that owners benchmark against $300–500 sets — with a persistent minority who hear the opposite: HiEndPortable's 'not very detailed, but very enjoyable', Chris Love's 'not the best in the price range', and the critical Reddit posts where the driver 'couldn't keep up' and 'does not separate the sounds well' on dense tracks.

“Note definition on the S12 is oh-so-sharp, so much so that I'd comfortably place it in the ~$500 bracket for resolution and playing with IEMs such as the venerable Moondrop Blessing 2.”

Precogvision, Headphones.com (original S12)

“Although there are sets with finer tuning, anything technical and resolving? Not one.”

Sifxt, Head-Fi

“I still maintain that the S12 PROs are not very detailed, but very enjoyable, musically speaking.”

cqtek, Hi End Portable

“in many musically complex tracks, I felt the driver couldn’t keep up.”

daniellow99, r/iems

Fast, low-distortion and punchy, with the macro-contrast reviewers keep calling 'engaging' and 'fun' — but a set that, despite 16 Ω / 102 dB, most say wants a real source: on a phone or a weak dongle it turns thin, dry or 'lacking impact', and on a warmer, more powerful one it fills out. Two critical owners never got the slam they expected from any source.

“The S12 hits harder and is perceivably less compressed for macro-contrast than not only its contemporary, but also pretty much every IEMs that I have heard for $150.”

Precogvision, Headphones.com (original S12)

“The S12 PRO needs some power to shine.”

Chris, The Headphoneer

“I have the impression that it lacks impact on the frequencies, the sound doesn't reach my ears in the same way, it's not visceral like with dynamic drivers for example.”

AnxietyComplex4128, r/inearfidelity

Open and wide enough for an IEM — 'surprisingly wide', 'almost holographic' from the enthusiasts, and better in depth than the 7Hz Timeless in most comparisons — but a solid minority (Headphonesty, Mister Zeng, JK on the S12, several Reddit owners) call it average, in-your-head, or wider than it is deep.

“The result harmoniously blends potent mid-tones with robust lows, coupled with a surprisingly wide soundstage and excellent respect for sound timbres.”

NanoTechnos, Headfonia

“The soundstage is unfortunately bang average and sounds in-your-head.”

baskingshark, Headphonesty

“The soundstage of the S12 Pro is average.”

Mister Zeng, Head-Fi

The single most agreed-on strength: precise placement, sharp separation and rich layering — 'spectacular', 10/10 from Head-Fi reviewers, and the reason it is a standing recommendation for competitive gaming. The only dissent is Precogvision's on the original S12, which called imaging its one technical shortfall.

“In the area of technicalities, the S12 Pro have above-average imaging, instrument separation, and layering.”

baskingshark, Headphonesty

“But here's where it gets exciting: the imaging capability is spectacular.”

K othic, Head-Fi

“the only point with which I'd consider the S12 to fall short in technicalities is imaging”

Precogvision, Headphones.com (original S12)

Sources split. For most the small, smooth, light shell sits flush and disappears — several sleep in it — and it fits where the 7Hz Timeless never did. For a third of the weight it is the record's sore point: a short nozzle that needs the right tip to seal at all, tips that pop off or stay in the ear, a stiff, heavy cable with aggressively curved ear-hooks that levers the shell out, pressure on the ear lobes or concha in long sessions, and a few who returned it in days. Amazon's own tallies run 11 positive / 6 negative on comfort and 7 / 8 on fit.

A near-unanimous strength on first contact — a solid, smooth CNC-aluminium shell that reads as a $200+ product, a thick 392-strand cable with genuinely useful swappable 2.5 / 3.5 / 4.4 mm plugs, and a generous tip-and-case bundle — with a real minority of caveats that keep it from 'strong': the modular plug is push-fit and can work loose, the 2-pin sockets and the stock ear-hooks draw complaints, condensation collects on the metal nozzle mesh in cold rooms, the anodising scuffs, support e-mails go unanswered, and a small tail of owners report one side going quiet after weeks to months.

“Unsurprisingly, build quality is top-notch, and if the Letshuoer S12 Pro is one of the most affordable planar, they don't feel like a cheap knock-off, far from it.”

NanoTechnos, Headfonia

“The cable is of good quality with low microphonic noise and it doesn’t get easily tangled but it is too thick and heavy.”

Petros Laskis, Ichos Reviews

“Stiff enough to hold normally at home listening, but when i use it with my Qudelix and keep it in my pant pocket while walking through transit and work, the modular bit regularly falls off.”

Luneyuun, r/headphones

“Great sounding IEMs but had one go bad after a couple months of use.”

Amazon verified purchase, October 2025

Above average for a vented planar once it seals — 'excellent noise-blockers' with the right tips, rated to 27 dB — but the short nozzle means shallow insertion, so a few reviewers find it merely average, and opening the mouth or moving the jaw can break the seal with silicone tips.

“Despite the vents, isolation is actually above average, and these would make for a good commuting pair of IEMs.”

baskingshark, Headphonesty

“With a solid shell, good tips and an ear-filling design, the Letshuoer S12 Pro were excellent noise-blockers”

NanoTechnos, Headfonia

“In terms of passive noise isolation its under performing in my case due the shorter nozzle length.”

zabiri, Head-Fi

Strong agreement that it delivers resolution, bass and build well beyond $135–169 — 'kinda hard to beat', a 'gold-standard' planar new sets are still measured against, and cheaper than the Timeless it out-fits — tempered by a real minority: HBB's 'cable-only upgrade' over the S12, Jaytiss's 4/10, IEMRanking's overall 6.3 'mixed to positive', the owners who bought into the hype and went back to a cheaper dynamic driver, and the steady pressure of newer planars (ARTTI T10, NiceHCK F1 Pro, the S12 Ultra) at or below its price.

“For consumers who want to board the planar hype train, the S12 Pro are arguably one of the better sets to consider.”

baskingshark, Headphonesty

“I absolutely love the LETSHUOER S12. It is reasonably priced and I have yet to find a competitor in this price category that sounds as good.”

Jürgen Kraus, audioreviews.org (original S12)

“If you’re mainly into gaming, they could be a solid pick. But if music is your priority, I’d suggest looking elsewhere—the hype doesn’t tell the whole story.”

daniellow99, r/iems

“For much less than half the price, I would go with the Artti T10 planar. You’re only giving some aesthetics and build quality.”

Intelligent_Dingo509, r/iems