In-Ear MonitorOverreview

7Hz Timeless

The planar that lit the budget-IEM fuse — loved for its detail and deep bass, argued over for its bright, peaky treble.

13 sourcesUpdated
$220Typical US price

Score aggregates reviewer opinions across topics.

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7Hz Timeless

The short version

What to know.

A ~$220, 14.2 mm planar-magnetic IEM from 2021, widely credited with kick-starting the budget planar-IEM wave. Reviewers broadly agree on what it does well: deep, generous sub-bass; quick, resolving detail that punches above its price; a wide soundstage with notably little depth; and a durable CNC-aluminium shell with a likeable cable (alongside reports of channel imbalance and unit-to-unit variance). They split, sometimes sharply, on the rest. The treble is heard as either airy and exciting or bright, peaky and fatiguing — an outcome that tracks tips, seal and unit variance as much as tuning. The bass-boosted, lightly U-/V-shaped tonality reads as fun, pleasing colour to some and a flawed, EQ-it signature to others. Mid-bass attack is called soft and undertextured by many; comfort divides owners between 'all-day' and 'hurts within an hour' depending on how the coin shell and short nozzle seat; imaging ranges from 'a strength' to 'two-dimensional.' It takes EQ and tip-rolling exceptionally well, wants a little more power than a typical single-DD, and — a landmark at launch — has since been crowded by newer planars like the Letshuoer S12 and Hidizs MP145 (and its own Timeless II).

About this product

The original 2021 14.2 mm planar-magnetic Timeless (MMCX, ~$220) — the set widely credited with kick-starting the budget planar-IEM wave. Not the 2023 Timeless II (14.5 mm, tunable nozzle), nor the later 'Timeless AE' anniversary variant.

The 7Hz Timeless landed in late 2021 as a ~$220, 14.2 mm planar-magnetic IEM in an unmistakable coin-shaped CNC-aluminium shell with a vinyl-record faceplate. Propelled by a wave of hype — not least an early Crinacle endorsement — it effectively kicked off the budget planar-IEM craze that soon gave us the Letshuoer S12, Hidizs MP145 and a dozen others.

Years on, it's both a beloved giant-killer and a lightning rod. Reviewers agree on its planar speed and detail, its deep bass, and a wide-but-shallow stage; they argue endlessly about its treble (airy and exciting, or bright and peaky), its bass quality, and whether that coin-shaped shell is supremely comfy or a fit nightmare. Plenty of opinion to average; plenty of disagreement to map.

A good fit for

  • Listeners chasing planar speed and detail with a fun, bass-boosted signature on a budget
  • People happy to tip-roll and EQ — foam tips plus a treble/bass tweak transform it
  • Sub-bass lovers who want deep rumble without a heavy mid-bass hump
  • Anyone who wants a durable all-metal IEM with a decent cable and a tank-like case
  • Listeners curious about the IEM that kicked off the budget-planar wave

Think twice if

  • You're treble-sensitive and won't tip-roll or EQ — the top end can read bright, peaky or sibilant
  • You want a reference-neutral tuning straight out of the box (it's coloured / U-shaped)
  • You want tight, hard-slamming, highly textured mid-bass
  • Your ears don't get along with a coin-shaped shell and a short nozzle
  • You want a deep, holographic soundstage with strong layering
  • You want today's planar price/performance leader — newer sets like the Letshuoer S12 and Hidizs MP145 have moved the bar

The reviewer consensus

Agreement &
disagreement.

5 / 12topics divide opinion
detailsoundstagedynamicsmidsbuildisolationvaluetreblebasstonalitycomfortimaging
7 Mostly agree5 Divided opinions

Common ground7

  • Deep, well-extended sub-bass with a generous bass boost — the low-end quantity is there.
  • Fast, resolving planar detail that punches above ~$220 — the headline reason reviewers recommend it.
  • Wide soundstage with notably little depth — an agreed shape, not a disputed one.

Points of contention5

  • Treble: 'crisp, airy and not fatiguing' vs 'bright, peaky, shouty or sibilant' — heavily tip-, seal-, and unit-dependent (foam tames it; a bad seal exaggerates it).
  • Bass quality: 'deep, full and fun' vs 'soft, rounded, undertextured mid-bass with limited slam' (and occasional bloom).
  • Overall tonality: a 'pleasing, fun U-/light-V colour' vs 'a flawed signature that's chock-full of minor issues and best EQ'd.'

A closer listen.

12 topics · 5 divided
Left: criticalRight: positiveTighter lines: more agreement

Treble

No overall leanDivided opinions
Reviewer sentiment9 supporting sources
CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

The single most-argued axis. One camp hears crisp, airy, well-extended treble that isn't fatiguing; another hears it as bright, peaky, even shouty or sibilant. The split tracks tips, seal and unit variance heavily — foam tips and a deeper seal tame it for many.

Measured

On the GRAS 45CA, amirm (ASR) flagged nearly 3% distortion around 1.8 kHz ('shockingly disappointing,' the planar panel resonating); reviewers localise a dip near 5–6 kHz and a peak around 7–8 kHz, with owners reporting channel imbalance up around 7–10 kHz.

vs. listeners — Graphs read the top end as bright-with-a-peak, but whether that lands as 'exciting' or 'fatiguing' is largely an ears/tips/seal outcome — foam or taller tips and a deeper seal calm it, and part of the upper-treble peak is a coupler/ear-canal artifact — so there isn't one 'true' treble here.

Where it splits
Bright / peaky / fatiguing — the treble is the weak spot.55%

“What's definitely in need of work is the treble response.”

Precogvision, Headphones.com
Crisp, airy and extended — not shouty or harsh.45%

“It's a treble that's crisp, detailed and airy, not to mention extremely quick.”

primeaudio.org
Link to this topic

The hardware

Specifications.

Checked

Design

Type
In-ear monitor
Drivers
1 × 14.2 mm planar magnetic (double-sided N52 magnet array, ultra-thin diaphragm)
Housing
aviation-grade aluminum CNC shell

Electrical

Impedance
14.8 Ω
Frequency response
5 Hz – 40 kHz

Connection

Cable
Detachable
Connector
MMCX
Plugs supplied
3.5 mm, 4.4 mm balanced, 2.5 mm balanced

Physical

Weight
5 g per earpiece

Manufacturer-published figures, not measurements · from linsoul.com.

Follow the evidence

Sources 13

1–6 of 13 sources

Read with context

Limitations & method.

As of

What to keep in mind 6

  1. This is a read of where opinion landed as of June 2026 — and the budget-planar field it kicked off has moved on, with sets like the Letshuoer S12, Hidizs MP145, and 7Hz's own Timeless II since crowding the space.

  2. A lot of 'too bright' or 'too shouty' complaints trace back to fit and tips rather than the IEM: the short nozzle and coin-shaped shell can sit shallow, and foam or taller tips (plus a small EQ tweak) tame the treble for many — so it's worth dialling in the seal before you judge it.

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