By aspect — in detail
The most-argued axis. The extension is agreed to be safe rather than sparkly, but the read splits. Most pro reviewers hear a smooth, relaxed, non-fatiguing top end — ideal for the treble-sensitive, if a little rolled-off and short on air for trebleheads. A community camp hears a neutral-bright, energetic presentation with a touch of sibilance on some tracks and warns the treble-sensitive away. The split tracks the tips (the wide-bore 'Vocal' tips and warmer aftermarket tips brighten and open it; the 'Balanced'/foam tips smooth it) and the source.
Measured
Highs carried by 2 Knowles BAs through 50 µm 3D-printed acoustic tubes and a 4-way crossover, tuned for a controlled top that extends to the air zone rather than a bright, peaky one (Hi End Portable reads it as 'extended but energy-controlled,' rolling into the air zone). Acho's read locates a presence/upper-mid rise around 2.5–3.5 kHz that lifts with the wide-bore 'Vocal' tips (a slight hint of sibilance on hot tracks) and settles with the narrower 'Balanced' tips — so the perceived treble/upper-mid energy is strongly tip- and source-dependent. FR on achoreviews.squig.link.
⚠ vs. listeners — The same top end is 'smooth / relaxed / non-fatiguing / slightly rolled-off' to most reviewers and 'fairly bright / a touch sibilant / not for the treble-sensitive' to a community camp. Because the wide-bore 'Vocal' tips (and warmer aftermarket tips) lift the upper mids while the 'Balanced'/foam tips tame them, and a warmer source smooths it further, there isn't one 'true' treble here — it's the tuning most reviewers meet with balanced tips vs the brighter one others meet with wide-bore tips or sensitive ears.
Where it splits
Smooth, safe and non-fatiguing — relaxed and ideal for the treble-sensitive; a touch rolled-off and short on air for trebleheads.62%
“This is more of a controlled and relaxed treble, which is ideal for treble-sensitive people.”
Headfonics (Nihal)
Neutral-bright and energetic — a touch of sibilance on some tracks; not for the treble-sensitive.38%
“For the treble sensitive folks, this IEM is clearly not for you; as this is a fairly bright IEM.”
r/iems (mournfulmonk)
Character is near-universally agreed — a clean, textured, sub-bass-tilted low end from the lone 10 mm dynamic, with a deliberately restrained mid-bass and little bleed; by common consent 'not a basshead set.' What splits the room is whether that restraint is well-judged or a genuine shortfall: most call the leanness appropriate and the sub-bass extension good, while a camp finds the mid-bass simply too light on impact and slam, notably for EDM and bass-forward genres. Tips and a warmer source add perceived weight.
Measured
One 10 mm dual-chambered beryllium-coated dynamic on a sub-bass-tilted shelf with a restrained mid-bass; Hi End Portable measures a smooth W-profile whose whole curve moves under 10 dB from 20 Hz–14 kHz. An easy 15 Ω / 102 dB load. He also flags that very-low pure tones carry a BA-like vibratory colouration rather than a fully natural dynamic-driver physicality — a technical nuance most conventional music hides. Perceived weight swings with tips (wide-bore loses bass, narrower-bore/foam adds it) and a warmer source.
Where it splits
Deliberately lean but well-judged — clean, textured, good sub-bass extension; the restraint suits the neutral tuning.60%
“While the midbass may be a little lower in quantity than many will expect, I find that it is really well balanced”
Acho Reviews
Too light — the mid-bass lacks impact and punch, wanting more slam for EDM and bass-forward genres.40%
“The mid-bass lacks the necessary impact and punch, but the sub-bass comes to the rescue with its decent rumble when there is a need.”
Headfonics (Nihal)
Mids
Strong consensus · 9 srcThe standout and the reason to buy. Near-unanimous praise: a mid-centric, forward, natural and lifelike midrange with excellent vocal timbre, clarity and resolution — the 'True Virtuoso' character. The only recurring caveats are minor and consistent: the lower mids can read a touch lean of body on some sources, and a very slight nasal/haze note surfaces for one or two reviewers.
“The Cadenza4 mids offer very decent clarity combined with a natural timbre, presented in a slightly forward manner.”
Headfonics (Nihal)
“Midrange steals the show combining refinement, dynamics, and warmth.”
Ear Fidelity (Michał Sommerfeld)
Measured
A flat lower-midrange rising ~8 dB into a 2.5–4 kHz upper-mid plateau (Hi End Portable) gives forward, present vocals with a natural pinna-gain balance; the second BA (Sonion) covers the mids. Several reviewers note male voices sit a hair lean of body while female voices carry more flesh — a consequence of the mild lower-mid dip and the upper-mid lift. Reviewers repeatedly call the timbre natural despite the BA drivers.
Broad agreement on the recipe: neutral to neutral-bright with a slight sub-bass lift and a hint of warmth — a balanced, coherent, Harman-adjacent W/U-shape, not V-shaped and not thin. The only friction is a matter of degree: most call it neutral-warm and safe, a community camp calls it neutral-bright, and that framing feeds the treble split above.
“The Cadenza4 has a neutral profile with a hint of warmth.”
Headfonics (Nihal)
“I think the Letshuoer Cadenza 4 has a smooth, decreasing W-profile, where each peak is polished and controlled.”
Hi End Portable
Measured
A neutral/neutral-bright target with a sub-bass lift: Hi End Portable measures a smooth W where the whole curve moves under 10 dB from 20 Hz–14 kHz. Specs: 15 Ω, 102 dB, 20 Hz–40 kHz; 1DD + 3BA (1 Sonion + 2 Knowles), 4-way electronic crossover, 3× 50 µm 3D-printed acoustic tubes. FR graphs on achoreviews.squig.link and Super* Review.
Soundstage
Moderate · 7 srcA consistent, if not headline, strength. Reviewers agree on a mature, open, out-of-head stage with good width and height for the price; depth is more often called standard/average than deep. Little real disagreement — the debate is only how far above its price it reaches.
“For the price, we get a really mature sound staging style.”
Ear Fidelity (Michał Sommerfeld)
“The soundstage has a decent width and good depth.”
Headfonics (Nihal)
A near-consensus strength — precise placement and excellent instrument separation and layering are repeatedly flagged, one of the technical highlights. The lone notable dissent comes from Headfonics, who rates imaging a step under the other technicalities, finding localization a little blurred.
“Imaging is excellent with precise note-weight definition and pinpoint accuracy.”
Head-Fi (showcase review)
“The imaging is not as strong as other technical aspects of this IEM.”
Headfonics (Nihal)
A qualified strength. Resolution and detail retrieval are called excellent for the price — clean, transparent, one owner rating it near his DT 1990 Pro — and a big part of why the set is respected. The honest ceiling: the ultimate micro-detail and air aren't stellar (the safe treble costs some), and it reads more musical than analytical, scaling with a resolving source.
“Resolution and details especially in the mid-range are excellent considering the price point.”
Head-Fi (showcase review)
“the micro detail is not stellar, and can even feel unobtrusive.”
Hi End Portable
Well-regarded but paced rather than slam-first — reviewers credit fast, clean, planar-like transients and good dynamics, but describe a musical, cadenced delivery over macro-punch (the lean mid-bass plays into that). It firms up with cleaner, stronger power and a balanced source.
“The speed of the drivers is excellent resulting in a seamless transient response like that of a planar contributing to its overall musical sound.”
Head-Fi (showcase review)
“There are dynamics, yes, and very good ones, but at their own pace.”
Hi End Portable
Mostly a plus — a light (5.4 g/side) resin shell that most reviewers rate excellent for fit and long, fatigue-free sessions. The recurring caveat: the shell is on the larger side with a long, wide nozzle and inserts fairly deep, so a minority find it an ergonomic challenge and fit/seal vary by ear (a demo helps).
“The Cadenza4 is very comfortable to wear.”
Headfonics (Nihal)
“Fitment can be an issue for some as it is a big iem, and it fits deep”
r/iems (mournfulmonk)
Measured
5.4 g per side; a HeyGears 3D-printed resin shell with a CNC-aluminium faceplate and a single pressure-relief vent (semi-open); a semi-custom shape with a long ~6.2–6.5 mm nozzle. Light and secure for most, but larger than the S15 it shares a family with, so insertion depth and fit are ear-dependent — and the stock tips don't suit every ear canal.
Isolation
Moderate · 5 srcGood for a vented resin hybrid once you get a seal — reviewers call it notably strong to very good, fine for commuting and everyday use, though not total silence. Little disagreement here; the main variable is the tip seal.
“The isolation capability of the Cadenza4 is notably strong.”
Headfonics (Nihal)
“the isolation I found to be very good.”
IEMs and Music
Measured
A single-vent semi-open resin shell, so good-for-casual/commute isolation with a solid tip seal rather than stage-grade silence; Acho publishes isolation curves at achoreviews.squig.link/isolation.
Solid and nicely finished, and the accessory story is a repeated highlight: the standout is the excellent 392-strand silver-plated modular cable (2.5/3.5/4.4 mm swappable plugs) plus a premium, jewelry-box unboxing. The asterisks come up just as often — the basic stock tips are the weak link (most upgrade), and the round screw-top case is durable but impractical.
“This cable has very good build quality and complements the aesthetics of the IEM.”
Headfonics (Nihal)
“The included tips are of a very basic quality.”
Ear Fidelity (Michał Sommerfeld)
Measured
1DD + 3BA in a HeyGears 3D-printed resin shell with a CNC-machined anodised-aluminium faceplate; standard 0.78 mm 2-pin; a 392-strand silver-plated monocrystalline-copper modular cable with right-angled 2.5/3.5/4.4 mm plugs; a round screw-top case and two tip styles (Vocal/Balanced), three sizes each.
Value
Strong consensus · 9 srcThe most one-sided verdict, and strongly positive — reviewers and owners repeatedly call it underrated/slept-on and an excellent all-rounder value at ~$229–249, punching above its price on timbre and technicalities. The only real dissent is soft: the price can feel a touch high in a brutally competitive ~$200–250 bracket, and it frequently sells lower, so patient buyers pay less.
“It is an IEM that is horribly slept on, almost completely overlooked and is akin to finding a real diamond in a trough.”
r/iems (mournfulmonk)
“it’s an absolute steal.”
Ear Fidelity (Michał Sommerfeld)
Measured
$249 MSRP ($229 open-box on the maker's store; frequently ~$199 and, on sale, ~$160; used pairs ~$100–120). Widely called underrated across editorial and community; Headfonics' reader poll sits ~8.3/10 and Letshuoer's own store shows 11/11 five-star — both small and self-selected, so weigh the written impressions over the number.
