By aspect — in detail
A bass-lifted, mildly bright signature with an upper-mid lift — but the four tuning nozzles genuinely move it, which is why reviewers label it everything from V-shaped to W-shaped to 'neutral with a touch of warmth.' The stock gold flat/'flower' nozzle is the consensus reference; dome/'bullet' nozzles trade upper treble for a warmer, punchier balance.
“The 7HZ Timeless II presents a well-balanced sound signature, leaning slightly towards the lower frequencies.”
Gökhan Aydın, MoonStar Reviews
“If you are sensitive to upper treble (10kHz+) Then using the dome shaped nozzles will be the safer choice, with the gold one being a bit safer than the silver.”
Bobjonez98, r/iems
Measured
audioreviews.org's own IEC711-corrected coupler measurements show a relatively steep gradient from 20 Hz into the midrange (a low-bass emphasis) and an upper-mid/lower-treble region that the nozzles clearly shift; the dome nozzles suppress the upper treble above the ~13 kHz coupler-resonance peak. HiEndPortable describes a moderate ~2 kHz hump on the stock gold nozzle.
For most reviewers the standout: deep, textured and unusually punchy for a planar, with sub-bass that digs low. The dissent is real, though — one critical, comparison-heavy review hears it as short on sub-bass rumble and shape and outclassed by newer planars, and another warns it can be too much on some tracks. It also scales hard with amplification, which explains part of the spread: on a weak source the low end sounds modest, on a powerful one it can turn huge.
“It’s rare for a planar IEM to deliver any sense of punch, but the Timeless II does it surprisingly well.”
Kurt, Headfonics
“Without a doubt, this is some of the best bass I’ve heard in planar systems.”
HiEndPortable
“Among planars, the Timeless II is considered to be top-tier for bass — but in my experience, it is outclassed both by cheaper, and more expensive planar sets.”
Aaron, resonancereviews.com
Measured
audioreviews.org's coupler graph shows a steeper 20 Hz→mids slope than the original — a genuine low-bass shelf — and its verdict lists 'Bass might be too much for some.' Owners report the low end is strongly source-dependent: 'With my timeless 2's I find that the bass response is VERY dependent on the amount of headroom an amp has to offer.' (Unable-Land9429, r/iems).
⚠ vs. listeners — The same measured low-bass shelf reads as deep and impactful to most listeners and as lacking sub-bass rumble/shape to a bass-focused critic; nozzle choice and amp power move where it lands, so the split is as much about system and expectation as about the tuning itself.
Broadly heard as clear, articulate and natural, with vocals that sit neither forward nor recessed and are noticeably weightier than the thin original. The recurring caveat, flagged even by fans, is that the lower midrange runs a little lean and cool, so vocals can occasionally thin out and some want more warmth and body.
“The midrange of the 7Hz Timeless II delivers energetic vocals with impressive clarity, neither feeling forward nor recessed.”
Kurt, Headfonics
“As is usual in this type of tuning, the first half of the mids is somewhat lean.”
HiEndPortable
“The Timeless II’s lower-mids are lacking in warmth and richness, and a mild increase in emphasis in the lower midrange would be a welcomed improvement.”
Aaron, resonancereviews.com
The defining split. Most reviewers hear an airy, extended, snappy top end that stays clear of fatigue; treble-sensitive listeners hear it as bright and forward, with sibilance or a planar 'grain' that comes out on poor recordings. It's strongly nozzle-, tip- and unit-dependent — the dome nozzles and wide-bore tips tame it, and owners report unit-to-unit variance in how sibilant it runs. (7Hz's aborted 2023 version was pulled for shouty highs and retuned before release.)
Measured
audioreviews.org measured the tuning nozzles as acting on the critical upper-mid/lower-treble region, with the dome nozzles rolling off the upper treble above ~13 kHz; that is the physical knob owners use to dial the brightness in or out.
⚠ vs. listeners — One brightish upper-treble tuning: airy and detailed to most, hot or sibilant to the sensitive — and because nozzle, tip and unit all shift it, two listeners can genuinely hear different sets.
Where it splits
Airy, extended and non-fatiguing — a clean, sparkly top end that avoids peakiness.59%
“The treble is airy and sparkly, yet never becomes fatiguing, even in busier tracks.”
Kurt, Headfonics
Bright and forward — emphasizes sibilance and can turn peaky or grainy for the treble-sensitive.41%
“Any sibilance in the recordings is also emphasized.”
Biodegraded, audioreviews.org
Soundstage
Moderate · 6 srcA consistent highlight: wide and spacious for an IEM, with unusually good height and an immersive, well-projected presentation. Depth is the softer axis — most call it good, a couple settle on merely average.
“One of the first things that strikes you about the Timeless II is its soundstage.”
HiEndPortable
“The Timeless II presents an expansive soundstage with impressive depth and height, creating an immersive listening experience.”
Delaney Czernikowski, Audio46
“The soundstage of the 7Hz Timeless II retains the spaciousness of the original while adding a slight improvement in height.”
Kurt, Headfonics
Widely praised — precise instrument placement with strong separation and layering, and a step up from the original thanks to the taller stage. No real dissent here, even from the set's critics.
“Imaging sees a notable improvement due to the taller vertical soundstage, allowing sounds to be placed more precisely.”
Kurt, Headfonics
“Instrumental separation is strong, as is layering.”
Aaron, resonancereviews.com
“Imaging is precise, allowing for accurate localization of instruments within the soundstage.”
Gökhan Aydın, MoonStar Reviews
Detail
Strong consensus · 6 srcThe strongest point of agreement: benchmark resolution, speed and transient response for the price, repeatedly called a class strength. The only nuance is from the critical camp — that the brightness can inflate the perception of detail — but even it grants the technical performance is strong.
“Detail retrieval is impressively refined and avoids the pitfalls of peakiness or excessive brightness.”
Kurt, Headfonics
“It exhibits strong technical performance and excellent transient response times, delivering robust, snappy, and responsive sound.”
Aaron, resonancereviews.com
“Speed, precision, driver resolution.”
HiEndPortable
Fast, snappy and punchy, with macro and micro dynamics improved over the original and midbass impact that holds up even at low volume. The recurring theme is scaling: it's easy enough to drive to volume but noticeably rewards a powerful, high-headroom source.
“In the rest of the range, leading-edge transients are perhaps quicker but dynamics – macro and micro – are certainly increased vs the originals.”
Biodegraded, audioreviews.org
“A notable feature is how the midbass retains its punch and impact even at lower volumes.”
Kurt, Headfonics
“With my timeless 2's I find that the bass response is VERY dependent on the amount of headroom an amp has to offer.”
Unable-Land9429, r/iems
Measured
15.2 Ω, 108 dB/V @1 kHz (≈ 90.4 dB/mW) — reachable from a phone, but reviewers and owners agree its low sensitivity puts it near max volume on weak sources and that it scales meaningfully with a more powerful amp.
Sources split as sharply on fit as on treble. The shell is a large, flat coin with a short nozzle and shallow insertion, so seal is very tip-dependent. Some seat it easily and wear it all day; others can't get a lasting seal, find it presses on the ear, or cap sessions at half an hour. Small ears and the tip you pick largely decide which camp you land in.
Where it splits
Fits and seals well — comfortable for long sessions once tipped right.54%
“Despite this unusual design paired with its deceivingly large circular faceplate, the IEMs fit well into my ears and properly seals too.”
Kurt, Headfonics
Tricky or uncomfortable — the big coin shell and shallow insertion fight some ears.46%
“Tricky fit, even if they do go in your ears”
Biodegraded, audioreviews.org
The all-metal shell is a near-universal strength — solid, cleanly machined and distinctive, at about 5 g per side. The nits sit around it: the modular cable is praised for feel but called stiff and heavy, the case is robust but bulky, and there are scattered reports of unit-to-unit variance and a nozzle that can work loose.
“The build quality of all of the metal parts is impeccable, with no sloppy machining or coating.”
Rudolfs, Headfonia
“The cable has a bit of heft to it, which adds a premium feel but makes it less practical for everyday portable use.”
Kurt, Headfonics
“one is sibilant and has fuzziness in treble and that distinct planar metallic sheen”
r/iems (owner, on two purchased units)
Isolation
Moderate · 4 srcAverage for a vented planar — enough to get by in moderately noisy places with a good seal, but not a deep-isolating set, and it leaks and lets more in than a fully sealed IEM.
“The passive noise isolation of the 7HZ Timeless II is average, but it is efficient enough for use in moderately noisy environments.”
Gökhan Aydın, MoonStar Reviews
“With the 7Hz Timeless II well-seated and sealed the isolation is about what I get from other ported IEMs.”
Rudolfs, Headfonia
A genuinely feature-rich package — four tuning nozzles, a modular 3.5/4.4 mm cable and a big tip selection — with performance most call excellent for ~$229, and several name it a reference in its segment. The counter-argument is time: four years on, cheaper and newer planars (the ARTTI T10, Kiwi Ears Aether and others) now deliver much of the technical performance for less, so opinion divides on whether the II is still the default budget-planar pick or just one strong option among many.
“the 7Hz Timeless II may become the new reference in the segment of planar IEMS for less than $250 and one of the best models in that price range.”
HiEndPortable
“It’s just that diminishing returns kick in really hard after the Artti T10.”
dr_wtf, r/iems
“But now there’s other planar IEMs that, depending on sound preferences, I would recommend instead.”
Aaron, resonancereviews.com
