By aspect — in detail
Tonality
Contested · 13 srcSources split, but not about what the headphone measures — about whether the shape works. Everyone describes the same voicing: mid-forward, linear in the bass, subdued on average up top, with a marked 2–3 kHz lift. One camp calls that an honest, near-neutral reference tuning in the new post-LCD-5 Audeze idiom. The other calls it thin and shouty, and says the peaks and dips are too uneven to be a monitoring tool. Note who is on each side: the split does not track measurement-versus-listening, it tracks taste.
Measured
Five independent rigs converge. RTINGS reads the signature as Flat with bass at -4 dB and treble at -5 dB; kuulokenurkka (IEC-60318-4 clone vs Harman 2018) finds strong emphasis at 3 kHz and around 1 kHz with linear bass and softer-than-expected treble; headphones.com (B&K 4128-C) finds a 2 kHz dip, a 3–4 kHz excess and a 4–6 kHz suckout; SoundGuys measures bass and treble both under their Studio curve with the energy concentrated near 3 kHz; and unheardlab measures it linear to roughly 4 kHz and uneven above. The tuning is not in dispute.
⚠ vs. listeners — The graph reads as a mid-forward, mildly recessed-at-both-ends studio curve — and that same curve is heard as reference-honest by Sound On Sound and RTINGS and as thin, aggressive and unfit for mixing by kuulokenurkka, headphones.com and SoundGuys. There is no measured difference behind the argument, only a difference in how much 3 kHz energy a listener wants.
Where it splits
A legitimate near-neutral reference voicing — flat overall, accurate where it counts.66%
“The Audeze MM-100 are very good when it comes to audio reproduction accuracy.”
RTINGS
Too mid-heavy to be neutral — thin and shouty, with a response too uneven for studio work.34%
“The sound is thin and shouty most of the time, accompanied by a narrow soundstage and flat dynamics.”
kuulokenurkka / Headphone Corner
The low end runs flat from the midrange down into the sub-bass with no shelf at all — every rig measures it and every reviewer hears it. The argument is only about quantity. To one camp that flatness is the point: clean, tight, well-extended and correct for a reference tool. To the other it is simply not enough bass, with sub-bass that barely registers. Almost everyone who takes the second view fixes it with a gentle low shelf, which the very low distortion makes easy.
Measured
RTINGS: Bass Amount Underemphasized (-4 dB). SoundGuys measures the response as much as 5 dB below their Studio curve below 200 Hz. headphones.com measures flat extension from the midrange out to the sub-bass with no elevation anywhere. unheardlab notes that the impact depends on the seal — breaking it audibly reduces the slam, so glasses and hair matter here more than on most planars.
⚠ vs. listeners — Both camps are right about different things. The extension is genuinely full and the quality genuinely good; the quantity is genuinely low. Whether a flat bass reads as reference-correct or as missing depends entirely on what you are used to — and on whether you will add a shelf.
Where it splits
Linear, tight and genuinely extended — a correct reference low end, strong for the price.56%
“The bass is clean and tight, with a decent sense of immediacy.”
unheardlab
Underweight — measurably below target, with sub-bass that barely announces itself.44%
“one that lacks low bass but features balanced mids and a recessed treble range”
RTINGS
The defining region, and the sharpest fight. Everyone agrees the midrange is pushed forward by a lift around 2–3 kHz, and that vocals sit close and clear as a result. Reviewers doing pro work and enthusiasts who like an intimate vocal call it the headphone's best quality — intelligibility that makes mix problems obvious. The other camp hears the same lift as aggression: shouty, dry, artificially sharpened, and made stranger by a dip at 2 kHz that sits right beside it.
Measured
headphones.com measures a noticeable 2 kHz dip with a slight excess around 3–4 kHz, and calls the result closer to a HiFiMan midrange than an Audeze one. kuulokenurkka measures the same pair of emphases at roughly 1 kHz and 3 kHz. Headfonics describes a narrow but strong 2–3 kHz peak that places higher-pitched vocals front and centre. All three agree the region is lifted and not smooth; the disagreement is about whether that helps you hear into a mix or gets in the way of the music.
Where it splits
Forward and articulate — vocal clarity is the headphone's strongest suit.59%
“These headphones offer remarkably similar performance across the board: both have a flat, accurate mid-range and a warm, smooth tonality.”
RTINGS (vs. Audeze LCD-X)
Too forward — thin, dry and shouty, and uneven next to the 2 kHz dip.41%
“Emphases at 1 kHz and 3 kHz often make the reproduction thin and shouty”
kuulokenurkka / Headphone Corner
The most interesting disagreement here, because both camps are describing the same curve — just different octaves of it. Below, a deep dip through the 4–6 kHz presence region takes the edge off percussion and all but eliminates sibilance, which is why several reviewers and most owners describe the treble as smooth, dark and completely non-fatiguing. Above it, narrow peaks around 6, 8 and 10–12 kHz ride on top of an otherwise low top end, which is why another group hears hiss, lisp and thin, tinny cymbals. Which one you get depends on your ears and your material, not on your unit.
Measured
RTINGS: Treble Amount Underemphasized (-5 dB), notably recessed. SoundGuys measures under-emphasis above 4 kHz. Headfonics measures a concerted 4–6 kHz drop with a stronger 8 kHz peak. headphones.com measures the same suckout at 4–6 kHz with emphasis at 10–12 kHz, and recommends a negative filter around 11 kHz. unheardlab measures 5–8 kHz recessed with a peak near 6 kHz and hot upper treble. kuulokenurkka measures the level dropping sharply at 4 kHz while everything above 10 kHz becomes too prominent.
⚠ vs. listeners — The average treble level measures clearly down, yet a sizeable minority hears the MM-100 as hissy or sibilant. That is not a contradiction: it is a low shelf with narrow peaks on it. A listener whose hearing centres on the missing 4–6 kHz calls it dark and smooth; one who catches the 8–12 kHz spikes calls it thin and splashy. Both readings come off the same graph.
Where it splits
Recessed and forgiving — the presence dip kills sibilance and fatigue, at the cost of some sparkle.61%
“The sound profile is relatively well-aligned with our target in the bass and mid-range, though the treble response is notably recessed and more closely follows the SoundGuys.com Studio Curve.”
RTINGS
Uneven — the narrow peaks above the dip read as hiss, lispiness and thin cymbals.39%
“Because the lower part of the treble is tonally powerless and flimsy, frequencies above 10 kHz tend to become too prominent.”
kuulokenurkka / Headphone Corner
Soundstage
Contested · 9 srcThe clearest weak point, though not a unanimous one. Most sources describe a small, centred, in-your-head presentation with limited width and little depth — one measurer calls it almost claustrophobic, another describes elements collapsing into three blobs rather than spreading across a field. A minority finds it perfectly adequate for the money, and one retail-affiliated outlet calls it holographic, which no one else does. Headfonics notes width and separation improve with a balanced cable and a stronger amp.
Measured
SoundGuys' MDAQS scores put Immersiveness at 3.1, the lowest of its three sub-scores and well below Timbre (4.3) and Distortion (4.1) — the algorithm flags the same weakness the listeners do. The forward upper midrange is repeatedly named as the cause: energy pushed at the listener does not spread around them.
Where it splits
Narrow and in-your-head — the stage is the headphone's real limitation.70%
“The soundstage of the MM100 is mediocre at best.”
unheardlab
Fine for the price — modest but rounded, with real depth behind it.30%
“The Audeze MM-100 produces a fairly rounded staging quality with reasonable depth, a forward midrange focus, and some sparkle in the upper treble.”
Headfonics (Marcus)
Consistently well regarded, and worth separating from the small stage. Within that narrow space, placement is precise and the centre image is solid — several reviewers who dislike the tuning still single out the imaging. The caveat is layering rather than direction: on dense material instruments can crowd, and depth is less convincing than left-to-right placement.
“Imaging, however, is extremely precise, and on most tracks it is very easy to tell which direction and where in the soundstage an instrument is.”
Head-Fi (bluranerd)
“What I really like is the stereo and left/right imaging, as well as the energetic, slightly forward vocal tuning.”
Headfonia (Lieven Vranken)
Measured
unheardlab measures good channel matching on a flat-plate coupler and describes the central image as solid and well-defined, while faulting lateral definition — an imaging-good, stage-small pattern that matches what listeners report.
Solid rather than remarkable, and helped by genuinely low distortion. Clarity in the midrange is the strong point — acoustic guitars, male vocals and mix faults all come through plainly, which is the whole point of a monitoring headphone. Several reviewers note that the uneven treble can read as extra detail without actually being it, and owners coming from other studio references find it a little less resolving than expected.
“The MM100 offers commendable clarity and resolution, particularly for the midrange sounds, like acoustic guitars and male vocals.”
unheardlab
“Less detailed sound than some other studio reference headphones”
Head-Fi (jeromeoflaherty)
Measured
SoundGuys: the planar drivers add very little harmonic distortion, and RTINGS records low harmonic distortion too — so the resolution on offer is not being masked. Headfonics reports the driver scaling audibly with a more capable amp, gaining dynamic range and resolution rather than changing tone.
Dynamics
Contested · 7 srcSplit, and the split is about macro versus micro. One camp hears unusually crisp transient attack and more textural contrast than pricier planars manage — headphones.com argues the rocky upper midrange is precisely what generates it. The other hears everything arriving at the same level: quiet detail pushed forward, loud detail held back, a wall rather than a landscape. That flattening is arguably useful for spotting mix errors and unhelpful for enjoying music.
Where it splits
Snappy and textured — more attack and micro-contrast than most planars at the price.55%
“MM-100’s most compelling technical narrative is that it’s actually a bit more textured and dynamic than other planars, including more expensive ones.”
headphones.com (Griffin Silver)
Compressed — little layering, everything played at one level.45%
“The MM-100 sounds regrettably compressed because the dynamics are mediocre, and there is hardly any layering in the reproduction.”
kuulokenurkka / Headphone Corner
Comfort
Contested · 10 srcThe most stubbornly divided aspect, and the one to try before you buy. The headband offers exactly three positions per side, fixed by screws, so the fit either lands on your head or it does not — and reviewers do not even agree on how hard it clamps. Some report near-zero clamp and a wobbly, insecure fit with the full 475 g hanging off a narrow strap; another reports clamping strong enough to make his ears ache in fifteen minutes, with the Fazor grille touching his ears. Others wear it for hours without a thought. The pleather-over-gel pads are glued in, so pad-swapping is not a fix.
Measured
475 g on a three-position suspension strap, with glued-in gel-filled pleather pads. unheardlab rates clamp medium-high and comfort 4/10; headphones.com reports barely any clamp at the setting that puts the cups at the right height; SoundGuys scores comfort 8.0 but lists limited sizing as a con. Those are not contradictory measurements so much as three different heads meeting three fixed notches — which is exactly why so many reviewers say to try it first.
Where it splits
Comfortable — the strap and gel pads carry the weight well for hours.64%
“the level of comfort on my head is much better than I expected”
Headfonics (Marcus)
Poor fit — heavy, awkward to adjust, and either clampy or wobbly depending on the head.36%
“As a result, my ears start to ache after just 15 minutes of listening, which is further exacerbated by the pressure sensation on the side of my head caused by the strong clamping force of the headband.”
kuulokenurkka / Headphone Corner
Broadly the headphone's least controversial strength. Magnesium yokes and grilles, a spring-steel headband, hand assembly in California and a chassis several reviewers say belongs at a higher price. The either-cup 3.5 mm entry is genuinely useful at a desk, though the shared internal wiring means most aftermarket cables will not work. The dissent is comparative rather than about failures: headphones.com finds it flimsy next to a Sennheiser HD 600, and the cost cuts are visible in the glued pads, the plain cable and the pouch instead of a case.
“the Audeze are considerably better built and more likely to be a durable, long-term option in the studio”
RTINGS (vs. HiFiMan Sundara)
“there are no obvious corners cut in build quality”
Sound On Sound (Sam Inglis)
“MM-100 is definitely heavier, but it’s also chintzier and feels less sturdy.”
headphones.com (Griffin Silver)
Measured
Magnesium yokes and grilles, spring-steel headband, 475 g, one-year warranty, hand-assembled and tested in Southern California. Worth knowing about the launch rather than the product: material shortages pushed the ship date back repeatedly through 2023, and kuulokenurkka reports that the very first finished units left the factory wired incorrectly. That was a first-run problem, and no later source reports reliability trouble.
Isolation
Strong consensus · 4 srcFully open-back, so there is effectively none — sound leaves freely and the room comes in. Expected for the type and not treated as a flaw by anyone, but it does rule out offices, commutes and shared rooms.
“Isolation wise this of course is a fully open back headphone, so music will leak out and noise will leak in.”
Headfonia (Lieven Vranken)
Measured
SoundGuys scores isolation 1.1 out of 10 and notes something more specific than plain openness: these headphones passively amplify noises from your surroundings in the 1–3 kHz range, a behaviour they have seen on a handful of other open-backs. In a noisy room that lands right where voices live.
The widest split in the whole file, and it turns on what you are comparing against. Measured against the MM-500, the MM-100 looks like a bargain — Sound On Sound reckons it delivers at least ninety percent of the sound for under a quarter of the cost, and at the current ~$299 street price several owners call it outstanding. Measured against the Sennheiser HD 600 and HD 650, the cheaper HiFiMan Sundara or the Aune AR5000, the critics say it simply loses. Nobody disputes that it needs EQ to be at its best, which is itself part of the argument.
Measured
$399 list, ~$299 on Audeze's own store and £387 at Thomann as of August 2026, against an MM-500 at $1,699. SoundGuys scores value 4.0 out of 10 and points to the Sennheiser HD 490 PRO and Beyerdynamic DT 900 PRO X; kuulokenurkka would want it nearer €350 and rates the Aune AR5000 above it; unheardlab grades value 7.5 out of 10 while noting the Sundara and Moondrop Para cost less. The verdict moves with the street price, which has fallen since launch.
Where it splits
A lot of Audeze for the money — most of an MM-500 at a quarter of the price, and better still near $299.65%
“Priced at US $399, the Audeze MM100 is a formidable entry in the mid-fi planar market.”
unheardlab
Overpriced for what it does — the HD 600/650 and cheaper planars do the job better.35%
“If you have $400 to spend on headphones for basically any sort of at-home or indoor use, you should just buy an HD 600 or 650 and call it a day.”
headphones.com (Griffin Silver)
