By aspect — in detail
Sources split on whether to call it neutral. The larger camp hears a flat, balanced 'reference' sound — the tuning the 7506 is famous for; a sizeable minority insists it's audibly bright and not truly neutral, coloured by a treble lift (and by bass distortion). The measurements support both: it's even through the low-mids and mids but tilted up on top — a neutral-bright monitor tilt.
Measured
Reads as neutral-bright: good agreement with the Harman target from ~100 Hz to 2 kHz and an even low-mid/midrange, but a modest, slightly under-emphasised bass and a pronounced presence/treble lift. RTINGS summarises the signature as Bass 'Underemphasized (-4 dB),' Treble 'Very Emphasized (5 dB),' overall 'Bright.'
⚠ vs. listeners — It genuinely is fairly flat through the low end and mids (the 'neutral' camp) while tilted bright on top with measurable bass distortion (the 'not neutral' camp) — the same response, framed by which half of the spectrum a listener weighs.
Where it splits
Neutral, flat and balanced — the dependable reference sound it's known for.58%
“All these characteristics combined, form the predictable and neutral sound that they are famous for.”
Sonarworks
Bright and treble-tilted — not actually neutral.42%
“This naturally will make the headphone sound bright and potentially with wider soundstage.”
Audio Science Review (amirm)
Everyone agrees it isn't a basshead can; they split on whether what's there is good. One camp hears tight, controlled, punchy bass that extends low enough; the other hears it as light/rolled-off in the sub-bass and measurably distorted — colouring or turning boomy when pushed. The split tracks something physical: the bass extends deep but at modest quantity, with high distortion and compression at higher levels.
Measured
It extends deep — DIY-Audio-Heaven measures bass to 12 Hz (−3 dB) with a ~150 Hz lift for punch — but quantity is modest (RTINGS: −4 dB, under-emphasised; SoundGuys: a dip from ~150–400 Hz) and distortion is the clearest objective knock: ~10% THD at 80 Hz/90 dB with bass compression (DIY-Audio-Heaven), nearly 20% at 55 Hz/114 dB (ASR), and a high 3rd-harmonic component that Sonarworks says adds audible colouration.
Where it splits· split roughly even
Tight, controlled and punchy — clean low end that extends low enough.
“while there is punch and power to the bass, it doesn't get boomy and distorted like other headphones can at this price point.”
TechGearLab
Light/rolled-off in the sub-bass and measurably distorted — colours or bloats when pushed.
“This headphone has more distortion at 94 dB than many do at 114 dB in bass!”
Audio Science Review (amirm)
The most consistent strength and the reason it endures as a vocal/tracking monitor: the midrange is repeatedly called clear, accurate and natural, tracking the target tightly. The minority report pulls both ways — a few hear the mids as a touch forward/shouty, a few as slightly recessed (there is a small upper-mid dip) — but the centre of gravity is firmly positive.
“These headphones have excellent midrange (500Hz to 2kHz) reproduction for the price.”
TechGearLab
“The lower mids are linear and meek, horribly shy.”
Head-Fi (user review)
Measured
Strong target agreement through the mids — ASR sees Harman agreement from ~100 Hz to 2 kHz, TechGearLab's measured mids 'followed our House Curve extremely tightly,' and DIY-Audio-Heaven calls them neutral with a lot of clarity — with a mild upper-mid dip (~2–4 kHz) and a lower-mid softening (~150–400 Hz) that a minority hear as slight recession.
The defining, most-argued axis. One camp hears the presence/upper-treble lift as harsh, sibilant and fatiguing — 'ugly highs'; the other hears it as bright but detailed and tolerable, even sweet, and the very thing that makes the 7506 useful for catching flaws. Both describe the same large, measured lift; the air above ~10 kHz is rolled off.
Measured
The lift is real and broad: Sonarworks measures a 4–10 kHz boost, SoundGuys ~+5 dB from 2.5–5 kHz, DIY-Audio-Heaven an emphasis all the way to 15 kHz that 'gives too much sharpness,' ASR an overshoot to ~8 kHz with an ~11 kHz peak; RTINGS rates the treble 'Very Emphasized (5 dB).' Above ~10 kHz the air rolls off (Sonarworks, SoundGuys, TechGearLab).
⚠ vs. listeners — The emphasis is objectively there; whether it reads as 'piercing/fatiguing' or 'bright but fine' tracks the recording (HSB: 'depends entirely on the track'), the source/amp (the 'sweet' verdict came off a tube amp), pad-damping or EQ mods, your ears, and whether you value a flaw-revealing brightness or want a relaxed listen.
Where it splits
Harsh, sibilant and fatiguing — a bright, peaky top end many reach to EQ or damp.60%
“Oh man these are ugly highs. Sharp and uncomfortable.”
Audio Science Review (amirm)
Bright but detailed and tolerable — sparkle, not glare (and the point of a monitor).40%
“the top end sounded sweet and pleasing.”
Explorations in Audio
Reads as revealing for ~$100 — the quality most tied to its monitor reputation: it surfaces blemishes in a mix that gentler headphones smooth over. The standing caveat is that much of that 'detail' rides on the bright presence/treble lift, so skeptics hear grain and brightness rather than true top-end resolution (the air is rolled off up high).
“Exceptional clarity and detail.”
Home Studio Basics
“Overall there was this poor quality and grittiness I could not get past.”
Audio Science Review (amirm)
Measured
Perceived detail leans on the presence/lower-treble lift rather than top-end air (which rolls off above ~10 kHz), and the measured bass distortion adds grain at higher levels — so it reads as clarity in the vocal/presence region more than true high-frequency resolution.
Typical closed-back: intimate and compact, fairly 'in your head,' and not a selling point — several call it small or flat. A minority find it acceptably spacious with decent layering, and the bright tilt can lend an impression of openness, but width and air are limited by the small closed cups.
“the MDR-7506 sounded less airy and more compact in terms of proximity to the listener and also soundstage.”
Explorations in Audio
“The MDR-7506 do a decent job at creating this sense of spatiality.”
TechGearLab
Measured
A small, closed enclosure with smallish cups caps width and air; instrument separation is described as present but not a highlight, and the bright tilt can read as 'wider' rather than genuinely open.
Genuinely split, and it tracks your anatomy. One camp finds it light and comfortable for long sessions; the other finds the smallish cups and firm clamp pinch the ears — the cups sit on, not fully around, many ears, so the driver foam presses on the ear. Glasses, larger ears and long sessions push people toward the second camp, and the non-breathable pads run warm.
Measured
Light (~210–230 g) with a medium clamp (DIY-Audio-Heaven measures 3.5 N), but the ear cups are smallish around a 40 mm driver, so for many ears they behave like a hybrid on-ear and the thin, non-breathable faux-leather pads press on the outer ear and trap heat. Glasses-wearers fare worse.
Where it splits
Light and comfortable — fine for long sessions.55%
“Most of our testers find them to be very comfortable and suitable for long sessions.”
Sonarworks
Small cups + firm clamp pinch the ears — pressure builds and the foam sits on the ear.45%
“I was surprised how uncomfortable the MDR-7506 is. It would pinch the outer areas of my ears to a point where I could not wear then for more than a few minutes.”
Audio Science Review (amirm)
A repeated strength: a metal-reinforced, foldable frame that survives years of abuse, with almost every part replaceable. The near-universal knocks are the fixed, non-detachable coiled cable and the faux-leather pads, which peel and flake within a year or two; the pad/plastic materials feel cheap and a measured channel imbalance hints at uneven QC.
“Foldable, durable, reliable”
MusicRadar
“The other aspect I did not enjoy so much was the non-detachable coiled up cable.”
Explorations in Audio
Measured
A metal-reinforced headband and housing, foldable, with replaceable pads, cups and (solderable) cable — built to last decades. But the ~3 m coiled cable is fixed/non-detachable, the faux-leather pads peel within ~1–2 years, the materials feel cheap, and Sonarworks measured channel imbalance of up to 5 dB in the low end — a QC asterisk on an otherwise tank-like design.
Closed-back, but only moderately isolating — and the split is really about use case. One camp finds it seals well for a quiet studio and blocks voices and higher sounds; the other finds it poor, because it does little against low-frequency rumble (the measured weak point), which makes it a bad commuter. It's seal- and pad-dependent, and leakage is low.
Measured
Blocks roughly 20–40 dB above 2.5 kHz but next to nothing below 500 Hz (SoundGuys); RTINGS rates isolation poor ('Bad noise isolation') while noting low leakage. So it dampens voices and highs in a quiet room but won't tame commute rumble — which is why studio users and commuters disagree.
Where it splits
Seals well for the studio — blocks voices and higher-frequency noise.55%
“I was surprised how well the lightweight ear cups worked in sealing me off from the outside world.”
Explorations in Audio
Poor — lets low-frequency and ambient noise straight through (bad for travel).45%
“Noises below 500Hz will sound virtually unchanged when you wear the MDR-7506.”
SoundGuys
The headline reason it's endured: cheap (~$90–110), near-indestructible, endlessly repairable and a decades-long studio/field default — many call it an easy recommendation. The real dissent is that, sound-wise, newer ~$100 headphones tune more to modern tastes, and a vocal minority feel its fame is now legacy and familiarity more than performance for the money.
“Organizations in need of many reliably good sets of headphones will gain a good price-to-performance ratio with the MDR-7506.”
SoundGuys
“the price is rather high for what MDR-7506 has to offer.”
Sonarworks
Measured
Around $90–110, decades on the market, cheaply repairable and hard-wearing — repeatedly counted toward its value. The dissent is comparative: reviewers note better-tuned rivals at the price (ATH-M-series, AKG K371, the V6/CD900ST siblings) and argue some of the reputation is legacy.