By aspect — in detail
Sources split on the same measured fact. Everyone agrees it reaches 20 Hz without the HD 600-style roll-off; the larger camp hears that as real authority, while the critical bench and several owners hear a low end that extends but does not punch — tight, polite, soft on the attack. There is no bass shelf on any independent rig, so the disagreement is about slam and quantity, not depth.
Measured
No bass shelf on any independent rig: Super* Review's KEMAR and Passion for Sound's B&K 5128 both hold 20 Hz within 0.3 dB of 500 Hz (Jaytiss's 5128 seating rolls off 4 dB), which is 4–5 dB under Harman 2015 below 100 Hz but 7.5 dB above an HD 600 and 3.8 dB above an HD 660S2 at 20 Hz on the same fixtures.
⚠ vs. listeners — The maker advertises a 5 dB shelf from 20 to 300 Hz and one review describes a basshead tuning with a 10 dB lift; none of the three rigs shows a shelf at all. The 'authoritative' camp is hearing extension, not quantity.
Where it splits
extended and authoritative for an open dynamic65%
“Sub-bass extension is excellent for an open-back dynamic driver, with the typical rolloff largely absent.”
Rudolfs, Headfonia
light and soft — extends but does not punch35%
“The bass is well-behaved but underwhelming. It extends reasonably well and remains tight, but it doesn’t deliver much impact or physicality.”
Andrew Park (Resolve), headphones.com
The most-agreed-on strength: natural, full-bodied, vocal-forward, with the texture and timbre most reviewers single out as the reason to buy. The dissent is narrow — a 2 kHz-area prominence that reads as forward at volume for one reviewer, a lower-mid dip that thins male vocals for the sharpest critic, and a lack of planar-grade clarity for a couple of owners.
“Its midrange performance is genuinely excellent, offering a nicely textured presentation that’s rare at this price or tuning type.”
Andrew Park (Resolve), headphones.com
“The midrange is where the Cypher truly shines. Vocals, in particular, sound remarkably natural and believable, with impressive tonal density, presence, and realism.”
James Fiorucci, ecoustics
“What a magnificent midrange.”
tombrisbane, Head-Fi showcase review
“the lower mids take a noticeable dip, causing male vocals to lose their natural body and note weight.”
DiegoCortez, Head-Fi showcase review
Measured
1.5–2 kHz sits 2–3.7 dB under the tilted diffuse-field target on all three rigs (2–4.4 dB under an HD 600 at 1–2 kHz on the same KEMAR); the 3 kHz ear-gain peak lands within about 1.5 dB of target.
Sources split three ways, and the graph shows why: a 5–6 kHz bump gives cymbals and consonants presence, then everything above 8 kHz falls away. Reviewers who listen to the lower treble call it crisp and clean; those who listen for air and sparkle call it dark and hazy; a third group hears the same relaxed top end and counts it as the whole point. One owner alone finds it hissy and treble-heavy.
Measured
All three rigs show a 5–6 kHz peak 3.5–7 dB above the tilted diffuse-field target, followed by a cliff: 8–10 kHz sits 7–15 dB under target on every rig, and the KEMAR stays 12–13.5 dB under out to 12 kHz.
⚠ vs. listeners — Both the 'crisp' and the 'dark' camps are describing the same curve from different octaves — lower-treble energy is above target, upper-treble energy is far below it.
Where it splits
present, crisp and airy enough46%
“The Cypher caters to the top-end enthusiasts, with crisp, realistic, clean high frequencies.”
Louis, Headfonics
smooth and relaxed, and that is the point27%
“The upside is exceptional long-term listenability. Cymbals, overtones, and ambient details remain present without ever drawing attention to themselves.”
Rudolfs, Headfonia
relaxed to the point of dark and hazy — lacks bite and air27%
“The treble lacks bite and incisiveness, often coming across as slightly hazy or indistinct.”
Andrew Park (Resolve), headphones.com
Tonality
Moderate · 25 srcMost describe a neutral, reference-leaning balance with a touch of warmth, and rate it highly for exactly that; the critical bench calls the same balance mid-forward and warm, one Kickstarter backer calls it bland, and the sharpest critic hears a top-heavy, unbalanced tuning. Because bass and upper treble both sit under target, the midrange is the part that stands out.
“The ThieAudio Cypher’s overall tuning is genuinely neutral and reference-oriented.”
Rudolfs, Headfonia
“This is a clearly mid-forward headphone with a tuning that prioritizes vocal presence and tonal richness over excitement at the extremes.”
Andrew Park (Resolve), headphones.com
“The best way to put this is there is no excitement here. These are really a boring set of cans.”
Vincent Chen, Amazon verified purchase
Measured
Bass 4–5 dB under Harman with no shelf, 1.5–2 kHz 2–3.7 dB under target, upper treble 7–15 dB under: what is left forward is the 200 Hz–1 kHz body and the 3 kHz ear-gain region.
Soundstage
Contested · 23 srcSources split, with the weight on intimate: most hear the HD 6-series 'in your head' presentation — depth and layering rather than width — and the critics call it cramped or congested. A smaller camp, mostly measuring it against an HD 600, finds it appreciably wider and well proportioned. Reference frame decides it.
Where it splits
intimate — the HD 6-series school of staging76%
“There’s limited sense of space or width here. If soundstage is a priority, this isn’t the headphone for you.”
Andrew Park (Resolve), headphones.com
wider than an HD 600, well proportioned24%
“Its soundstage is appreciably wider, and its imaging is more precise”
James Fiorucci, ecoustics
Imaging
Contested · 16 srcSources split, but most call placement precise and stable — several rank it the technical highlight — while the critical bench hears softened transients blurring separation and one reviewer calls it static. The dissent tracks the treble decision: less upper-treble energy means less edge definition on the cues imaging is built from.
Where it splits
precise and pinpoint69%
“Imaging on the ThieAudio Cypher is precise. Individual instruments occupy distinct, stable positions in the soundfield, and phantom image placement is convincing even as arrangements grow complex.”
Rudolfs, Headfonia
soft and average — transients blur placement31%
“The soundstage feels congested, imaging is static, and it severely lacks depth and pinpoint localization.”
DiegoCortez, Head-Fi showcase review
Mostly praised as resolving for a dynamic driver at the price — micro-detail without a treble lift to fake it — with the caveat, repeated by several, that planars at the same money resolve more. The critical bench hears detail smoothed over rather than revealed.
“A high amount of micro-detail is produced by this headphone around the midrange and high frequencies over the average model in this price tier.”
Louis, Headfonics
“It doesn't impress with a large soundstage or a lot of microdetails.”
DanHiFi, Head-Fi showcase review
Dynamics
Contested · 19 srcSources split almost evenly. The critical bench and a run of owners hear a soft-edged, low-contrast presentation that trades excitement for ease — kick drums dulled, transients rounded; others hear a quick, well-controlled driver that punches when the recording asks. Several in the first camp say tube or R2R sources add the missing body.
Where it splits
soft-edged — little slam or contrast56%
“However, it does go a bit too far in the warm direction, so this emphasis on warmth and ease of listening does come at the expense of a bit of contrast and dynamism.”
Andrew Park (Resolve), headphones.com
quick and punchy when the track asks44%
“Both macro- and microdynamics are handled competently, with the driver responding quickly to dynamic shifts in the music.”
Rudolfs, Headfonia
Mostly rated comfortable for long sessions — soft velour pads, a lambskin strap, 411 g carried well — but the complaints are specific and repeat: the strap's padded insert concentrates weight into a crown hotspot after an hour or two, clamp is firm when new and grows with head size, the compliant pads compress until ears touch the baffle, and the yokes are stiff. Head size and ear depth decide which report you get.
“Weight distribution is even, clamp force is controlled, and it sits securely without creating pressure points.”
Ianbanz, Pineapple Audio Reviews
“Its concentrated padding creates pressure hotspots that become increasingly noticeable over time, and after roughly two hours of continuous use, they can become genuinely uncomfortable.”
James Fiorucci, ecoustics
“The clamp is slightly on the tighter side—especially for larger heads—and the pads, while soft and compliant, compress enough that ears may touch the inner chamber that houses the baffle and driver.”
Andrew Park (Resolve), headphones.com
Materials and finish are praised almost without exception — CNC aluminium cups, steel headband, no creaks, 'kilobuck' build at $399 — so the argument is about consistency, not quality. Three measured units run right-channel-hot in the upper mids, one owner hears the right cup quieter, the cup-swivel stiffness differs side to side on some units, the magnetic pads are proprietary, and the warranty is one year.
“Right out of the gate, I have to say the build quality here is outstanding.”
David Becker, Prime Audio Reviews
“Measurements indicate that the left and right channels have a persistent 2dB difference through the midrange, which is the kind of imbalance that will be audible to most people and shouldn't be an issue for a headphone at this price.”
Andrew Park (Resolve), headphones.com
“Cypher is great sounding headphone, period, but i have feeling QC isn't at best standard”
SatorArepo, Head-Fi showcase review
“The trade-off is that the pads are proprietary, which could make replacements harder to source once the originals eventually wear out.”
James Fiorucci, ecoustics
Measured
Every unit measured with both channels runs right-hot in the upper mids: about 1 dB from 1.5–8 kHz on Super* Review's KEMAR, 0.8–2.3 dB from 1.5–5 kHz on Passion for Sound's 5128, and a stated 2 dB through the midrange on headphones.com's unit.
Isolation
Moderate · 9 srcOpen-back in name, semi-open in practice: nearly everyone who mentions it notes that it attenuates the room and leaks less than a true open-back, which some count as a bonus and one owner blames for the small stage.
“Lastly, despite being labeled as open-back, the Cypher behaves more like a semi-open design.”
Andrew Park (Resolve), headphones.com
“In other words, they provide ample isolation for an open-back headphone while maintaining the virtues of both open-back and closed-back designs.”
Louis, Headfonics
Sources split, with the weight on worth it: most editorial and owner voices call it a strong buy at $399 for the build and midrange, and several rank it above an HD 600/650 outright. The critical bench — the retailer's 5.4/10, the 3/5 measurement review, the sharpest Head-Fi critic and the 'isn't leagues better' Reddit take — finds it hard to recommend outright against an HD 600, Sundara or Edition XV, especially with the QC caveat.
Where it splits
worth the $39976%
“It’s a rare occasion to find a headphone with such build quality, and that sounds this good for the posted asking price.”
Louis, Headfonics
