By aspect — in detail
Broad agreement on the character, some spread on the label: a warm-leaning, coherent, musical tuning — variously called warm-neutral, gently V-shaped, or a 'refined W-shaped tuning with a warm tilt' — with elevated bass, natural mids and a relaxed (uneven) top end. Everyone agrees it isn't neutral, bright or clinical, and that single-DD cohesion is a real strength; whether the coloration is well-judged or 'quirky' is exactly where the treble camps below diverge.
“offering a tuning that falls in the vicinity of warm-neutral, while offering a wide soundstage and strong imaging”
Bloom Audio
“The ASTRU leans into what I'd call a refined W-shaped tuning but with a very clear tilt towards warmth”
Twister6 Reviews
“The Astru features a gently V-shaped sound signature.”
Head-Fi showcase review
Measured
On ATechReviews' coupler the Astru measures a moderate sub-bass shelf (~+8 dB at 20-30 Hz over 1 kHz) tapering smoothly through the mid-bass into neutral low-mids, an ear-gain peak of ~+6.7 dB near 3.4 kHz, and an uneven treble — a warm, gently V/W-shaped balance rather than a neutral one. Resolve, measuring on a 5128 with a JM-1 diffuse-field baseline, independently calls it 'mildly W-shaped.'
Bass
Strong consensus · 9 srcA near-universal strength, and the one thing every source agrees on — including the harshest critic. It's elevated but tasteful: real sub-bass reach and warm mid-bass body, prized for texture, control and quality over sheer quantity, and it stays clean without bleeding up into the mids. It is explicitly not a basshead tuning, so a few listeners wanting big slam or quantity note some tracks could use more weight; it also firms up with more power.
“Overall, ASTRU's bass is more about refinement than excess and balance than boost.”
Headfonics
“The bass is excellent—authoritative, weighty, fun”
Resolve, Headphones.com
“This is not a bass-head tuning, and it doesn't try to impress with sub-bass rumble.”
Twister6 Reviews
Measured
The measured sub-bass shelf (~+8 dB at 20-30 Hz relative to 1 kHz, tapering to ~+4 dB at 100 Hz and into a neutral lower-midrange) matches the 'elevated but not basshead' consensus: sub-bass-tilted, with the elevation rolling off smoothly through the mid-bass rather than piling up there or bleeding into the mids.
The most-praised aspect. Reviewers consistently call the midrange rich, warm, natural and lush, with deep, 'harmonically-complete' vocals and convincing acoustic timbre — the core of Meze's house sound. The one recurring caveat: the upper-mids are pulled back a touch (about 1-2 dB below a reference target), which keeps it non-shouty and organic but trades a little vocal forwardness and intelligibility in dense mixes.
“The midrange is where ASTRU really shines. It's rich and natural, easy on the ear without being too forward or too recessed.”
Headfonics
“male vocals sound deep and harmonically-complete”
Head-Fi showcase review
“Astru offers natural timbre with acoustic instruments along with rich vocals that convey strong emotion. The vocals are pulled back just slightly”
Bloom Audio
Measured
Neutral low-mids with an ear-gain peak of about +6.7 dB near 3.4 kHz — a touch below the ~8-10 dB pinna gain of a strict reference target, which fits the 'relaxed, non-shouty upper-mids' reports (Twister6 estimates ear gain 'pulled back by about 1-2dB').
The flagship disagreement — and the whole reason this set is 'controversial.' Most reviewers hear a smooth, safe, non-fatiguing top end with no hard sibilance (a few even call it resolving), if a little rolled-off and short on air and sparkle. A measurement-informed minority hear the same treble as uneven and fatiguing, with cymbals that turn crunchy or harsh. It is not a headcount vs a coin toss: the treble genuinely measures jagged, so it lands differently depending on your ear anatomy — the split tracks the listener, not the unit.
Measured
The treble measures uneven on ATechReviews' coupler: presence peaks of ~+6 dB near 4 kHz and ~+5 dB near 8 kHz, a deep dip centered ~11-12.5 kHz (about −12 dB), then a rebound toward neutral by ~15 kHz — the 'wibbly-wobbly' shape and 12.5 kHz dip several sources note.
⚠ vs. listeners — That jagged treble is precisely why listeners split. The deep upper-treble dip reads as 'smooth, safe, lacking air' to most, while the 4-8 kHz presence peaks land as 'crunchy/fatiguing' on some ears — Resolve demonstrates the very same graph swinging from tolerable to harsh as he substitutes different individual HRTFs, so how it lands is largely down to your own ear anatomy (plus tips and source), not a defect one way or the other. Meanwhile a treble-sensitive Head-Fi reviewer calls it 'the best treble performance of any single dynamic driver IEM I've heard, bar none' — the same set, the opposite pole.
Where it splits
Smooth, safe and non-fatiguing — no sharpness or sibilance, easy for hours; some find it a little rolled-off and lacking air/sparkle, but that's the point.70%
“you get treble that never turns sharp, never fatigues, and fits naturally with the rest”
Headfonics
Uneven and fatiguing — quirky treble with hotspots that make cymbals and percussion sound crunchy or harsh, depending on your ears.30%
“Cymbals sound crunchy and harsh, and most percussion loses any claim it has to natural timbre.”
Resolve, Headphones.com
Soundstage
Moderate · 8 srcGenerally a plus, with real spread on scale. Most describe a wide, wraparound, three-dimensional and immersive stage with strong separation and layering; a dissenting view hears the width as only moderate/intimate rather than expansive. Nearly everyone agrees depth and overall size are good-not-huge, and that the stage opens up further on a more powerful source.
“Astru's soundstage feels wide and three-dimensional with a strong feeling of separation and space between instruments.”
Bloom Audio
“instruments spread convincingly across the left-right axis without sounding artificial or processed. Depth, however, was more modest”
Headfonia
“Width is moderate, but there's a decent sense of depth, which helps with layering.”
Twister6 Reviews
Solidly praised. Placement is stable and natural and separation/layering hold up even in dense passages, so instruments are easy to locate. The consistent caveat is that it isn't razor-sharp, etched, 'pinpoint' imaging — it favors a cohesive, whole-picture presentation over surgical edges (one reviewer does call the placement 'pinpoint').
“The Astru communicates pinpoint instrument placement while maintaining an immersive scale.”
Major HiFi
“Imaging is stable and natural, but not razor-sharp. You can place instruments without effort, but the edges aren't etched.”
Twister6 Reviews
“The Astru maintained composure even when the music got genuinely chaotic, separating individual elements cleanly without smearing transients.”
Headfonia
Good for a warm single-DD, but delivered gently rather than thrown at you. Some hear the resolution as genuinely impressive (especially the upper mids); others frame it as understated and not the last word in raw technicality. Both camps agree the presentation prioritizes musical flow over spotlighting micro-detail, so it under-impresses in quick A/B demos and rewards longer listening.
“detail retrieval was genuinely impressive throughout, particularly in the highs and upper midrange”
Headfonia
“Detail retrieval is actually quite decent for a warm tuned IEM, but it's presented in a very understated way.”
Twister6 Reviews
“It may not be the last word in raw technical performance, but it is highly immersive and slowly draws you in.”
Headfonics
A moderate strength. Macro-dynamics are consistently called solid — it can swing and hit with authority when a track asks — while transients and micro-dynamics are described as slightly softened and polite rather than sharp and immediate, in keeping with the warm, smooth voicing. Dynamic punch also scales noticeably with a more powerful source.
“Macro dynamics are actually pretty solid. ASTRU can hit with authority when the track asks for it.”
Headfonics
“Transients, however, are slightly softened. Attacks don't have that sharp, immediate edge”
Twister6 Reviews
Measured
Rated 32 Ohm / 111 dB SPL/mW — easy to drive from a phone or dongle, but multiple reviewers note the dynamics wake up and the stage opens on a more capable source, so it's easy to power yet rewards a better one.
Comfort
Strong consensus · 7 srcA standout, near-universal positive. The shells are tiny and, at ~13.4 g the pair, remarkably light for all-titanium — ergonomic, hotspot-free and prone to 'disappearing' for indefinitely long sessions, even lying down. The only friction is fit-dependent: one reviewer with average-size ears needed some tip-rolling to get a proper seal on the small nozzles.
“The Astru is one of the most-comfortable IEMs I've used. I am able to listen to it indefinitely without any discomfort.”
Head-Fi showcase review
“Astru's compact shell and smooth contours make it one of those IEMs you forget you're wearing after a few minutes.”
Twister6 Reviews
“getting a proper seal can take some patience”
Headfonics
Measured
Meze specs the pair at 13.4 g (0.47 oz) in one-piece CNC-machined pure titanium — genuinely light for a metal IEM, which reviewers credit for the all-day comfort.
Isolation
Moderate · 4 srcMiddling and tip-dependent — the one place the small-shell design gives a little back. Once well-sealed one reviewer calls isolation surprisingly strong; others land on 'average' or note the stock tips didn't seal well for them. Expect decent, not class-leading, passive isolation that hinges on getting the right tips.
“Isolation is surprisingly strong for such a small design.”
Headfonics
“not class-leading, but more than sufficient for everyday use and even moderate commuting”
Twister6 Reviews
“I did not get the best passive isolation with the stock eartips.”
Head-Fi showcase review
The shell and cable draw near-universal praise; the case and extras draw a near-universal shrug. The one-piece CNC titanium shell is called flawless, seamless and jewelry-like, and the silver-plated 4.4 mm-balanced stock cable is singled out as unusually good. The recurring gripes: the minimalist grey look reads plain to some, the satin finish can micro-scratch, and the PU-leather case (plus the tip/accessory set) is seen as a step down and underwhelming for $900.
“the build quality is absolutely flawless”
Headfonia
“the titanium shells feel solid, refined and genuinely premium in hand”
Twister6 Reviews
“For $100 more, it's disappointing to see a regression in case quality.”
Head-Fi showcase review
Genuinely split. One camp sees a coherent, premium, superbly comfortable titanium flagship that finally lets Meze compete with the Chinese sets that own the $500-1000 bracket — quite possibly their best IEM yet. The other sees a set you pay a premium for on build, brand and comfort rather than class-leading technical performance, with a safe tuning cheaper rivals match and a case/accessory package that disappoints at $900 (and, for the critic, a treble that simply doesn't land).
Where it splits
Worth it — a premium, coherent, exceptionally comfortable titanium flagship that competes with the best in the $500-1000 bracket; Meze's best IEM yet.60%
“they're genuinely competing with the Chinese brands that have been dominating the $500-1000 IEM bracket for years”
Headfonia
You pay for build, brand and comfort — the tuning is safe rather than class-leading, cheaper sets match the technicalities, and the case/accessories fall short for $900.40%
“For $900, it's fair to expect a more-comprehensive out-of-the-box experience.”
Head-Fi showcase review
