By aspect — in detail
Consistently described as warm, relaxed and bass-forward, with a smoothed, un-bright top end — the deliberate inverse of the usual planar 'glare.' The exact label varies (V-shaped, neutral-to-dark, mild U-shape, warm-neutral), but every source agrees it is warm and non-fatiguing rather than bright.
“It went for a warm sound with a neutral kind of tone and timbre, and that’s actually not very common for a planar here.”
MotherX1, Sonic Mantra
“It is a smooth, somewhat dark profile, nuanced in the high end, musical and pleasant.”
hiendportable
“their bass appears to be elevated by the fact that the trebles are very smoothed, but fortunately, tonality is unaffected, resulting in a neutral result.”
Pietro, Mobileaudiophile
Measured
hiendportable describes a balanced response that 'moves within 9 dB between 20 Hz and 10 kHz,' slightly boosted in the bass; on ASR, HBB notes the graph looks dark on paper yet subjectively counters typical planar brightness.
The most consistently praised trait: dense, deep, textured and controlled, repeatedly called the most 'dynamic-driver-like' bass on a budget planar — physical without distorting, even at volume. The caveats are a minority: a couple of listeners find the texture merely okay, the sheer quantity 'too much,' or the punch a touch loose.
“The bass is fantastic. It’s very well defined and has just the right amount of presence.”
Chris, The Headphoneer
“In terms of bass, I think it is the planar IEM that, at the moment, is closest to the result that a DD can give you.”
Pietro, Mobileaudiophile
“The bass of the Letshuoer S08s is dense, full-bodied, physical and dark.”
hiendportable
Measured
Sub-bass extends fully with planar-typical low distortion; hiendportable measures the response 'slightly boosted in the bass' and reports it stays 'under control, without distortion even at high volumes.'
Sources split. One camp hears a warm, full-bodied, natural midrange — not overly recessed, with weighty male vocals; another hears it as recessed or uneven, with female vocals turning thin or fragile. The split tracks a measured ~3 kHz dip and the relaxed upper-mids, and it responds well to a little EQ there.
Measured
Acho Reviews measures a dip around 3 kHz that thins some female vocals; the reviewer notes 'some slight reshaping of the upper mids makes them come alive.'
⚠ vs. listeners — The same relaxed upper-midrange is one measured tuning: it reads as warm, full and natural to some (and on most male vocals), and as recessed, thin or uneven to others (and on some female vocals) — and a little EQ around 3 kHz shifts which way it lands.
Where it splits
Warm, full-bodied and natural — not overly recessed, especially on male vocals.56%
“We can define them as mids with a decidedly warm tone that preserves their neutrality without distorting the timbre of the sounds.”
Pietro, Mobileaudiophile
Recessed or uneven — female vocals can turn thin, fragile or harsh.44%
“There is a dip in the 3k range that sort of hollows out her voice in that range, putting emphasis on the frequencies just below and just above that range, making her come across a little fragile and also harsh in her upper vocal ranges.”
cqtek, Acho Reviews
The defining split. To one camp the smoothed, relaxed top end is the whole point — a welcome, non-fatiguing relief from the usual planar shout. To another it is dark, veiled and short on air and extension, dull on some tracks. Crucially, the reading is strongly tip-dependent: wide-bore tips lift the top a couple of dB, and the wrong tips can make it sound veiled.
Measured
The FR shows a relaxed, low-energy treble; on ASR, HBB warns the graph makes you 'expect a rather dark, muffled sound signature…but it is not.' hiendportable hears the same low-shimmer region as 'mild and muffled,' with 'the amount of air also feels limited.'
⚠ vs. listeners — The graph's relaxed treble is a single physical fact heard two ways: as a fatigue-free break from planar brightness by some, and as veiled or air-starved by others. It is unusually tip-sensitive — wide-bore tips open it up, while stock or narrow tips can leave it sounding closed-in.
Where it splits
Smooth, refined and non-fatiguing — deliberately tames the usual planar glare.54%
“This FR seems to counter balance the typical glare and shoutiness of planar drivers.”
Human Bass, Audio Science Review
Dark and rolled-off — limited air and extension, dull on some recordings.46%
“Treble extension is not the best and can lead to a little sensation of dullness on certain tracks, depending on what the style of recording is.”
cqtek, Acho Reviews
Soundstage
Contested · 8 srcSources split. A minority hear a genuinely wide, spacious stage for the price; most hear it as intimate and 'in the head,' a direct consequence of the warm, sub-bass-forward tuning narrowing the presentation. Several note strong 3D placement within whatever space there is.
Where it splits
Spacious and wide for an IEM at the price.40%
“I am impressed with the detail and the space that these IEMs offer, with good separation both left to right and front to back.”
cqtek, Acho Reviews
Intimate and narrow — the warm, bass-forward tuning keeps it 'in the head.'60%
“the soundstage is not as enveloping as I would have expected.”
Pietro, Mobileaudiophile
Mostly positive with one clear dissent. Several reviewers praise the separation and a notably precise sense of 3D placement — even within a small stage — while one outlet finds instrument separation sub-par and congested in busy midrange passages.
“The soundstage is really small, but it manages to give an exceptional sense of 3D imaging within that tiny space.”
dr_wtf, r/iems
“The S08 also offers excellent separation of instruments.”
Chris, The Headphoneer
“The S08’s imaging performance was sub-par, especially within the midrange.”
Meldrick, Headfonics
Broad agreement that this is a fun, musical, easy-listening set rather than a top-tier resolver: planar speed and cleanliness are there, but detail is 'good, not class-leading' for most. One outlet dissents, rating detail retrieval highly.
“The Letshuoer S08 are probably the least technical planars that focus more on the fun side”
Pietro, Mobileaudiophile
“Despite not being as resolving as other planar IEMs, its mild U-shaped sound signature creates an exciting listening experience that doesn't sacrifice mid-range performance.”
Meldrick, Headfonics
“The S08 has very good detail retrieval across the frequency range.”
Chris, The Headphoneer
The planar calling card: quick, clean 'responsive attack' — notes that pop and decay without bloom — is widely appreciated, while macro-dynamic slam is rated merely good, with the strongest contrast in the bass.
“The driver just has this timbre and responsiveness that is immediate.”
MagnumPP, r/iems
“Dynamics are good, but not spectacular. The most dynamic contrast is in the bass region.”
Chris, The Headphoneer
Most find the small, light, ergonomic aluminium shell comfortable enough to forget — good for long sessions. A minority struggle with the short set and nozzle/ear-hook angle, and (as with the sound) the seal is tip-sensitive.
“The S08 housing is CNC-machined aluminium and is very compact and light. I find it very comfortable.”
Chris, The Headphoneer
“the S08’s more ergonomic shape fit better in the ear and made me forget that I was wearing them in the first place.”
Meldrick, Headfonics
“Surprisingly, I have to admit that they are not the most comfortable, despite the shape of the shell being good.”
Pietro, Mobileaudiophile
The CNC-aluminium shell and modular 2-pin cable feel a class above the price — near-universal praise for materials, finish and tolerances. The asterisk is reliability: a recurring cluster of owner reports of driver failure and metal-shell condensation, enough that some who like the sound have stopped recommending it.
“The 3D printing is beautiful, but the CNC-machined metal shell is on a completely different level.”
Pietro, Mobileaudiophile
“LETSHUOER did a good job with the tolerances of the shell, the seam between the two halves was so thin that I initially thought the entire body was constructed out of a single piece of aluminum.”
Meldrick, Headfonics
“They're not precisely cheap IEM's and their durability is disappointing for the price.”
ChikistrikisWave, r/iems
Isolation
Moderate · 3 srcAdequate to good for a vented set — the ear-filling shell and inclined nozzle seal well with the right tips, blocking low-frequency noise better than voices, on par with price-mates.
“For a vented IEM, the S08 has decent isolation performance.”
Meldrick, Headfonics
“the base of the mouthpiece and its inclination are also responsible for a great fit and good isolation.”
hiendportable
Value
Strong consensus · 8 srcThe strongest agreement: at $99 you get a premium-feeling metal shell, a genuinely nice modular cable and a distinctive warm-planar tuning that punches above its price. The only real pressure is a crowded budget-planar field — including Letshuoer's own brighter S12 2024 a small step up.
“Having discovered the price of the Letshuoer S08s at $99, it’s clear that the competition has a tough time against them.”
hiendportable
“you have a sub $100 set of IEMs that is well built, comfortable (to my ears), looks good (to my eyes) and performs well”
cqtek, Acho Reviews
“For a price under 100 USD, you take home a beautiful IEM complete with quality accessories.”
Pietro, Mobileaudiophile
