Best Lists · Spec comparison
| Product DB | Driver | Impedance | Sensitivity | Frequency | Weight | Battery | ANC | Year | Price |
|---|---|---|---|---|---|---|---|---|---|
| 7Hz Timeless | Planar | 16 Ω | 102 dB | 5-40000 | 10 g | — | No | 2022 | $219 |
| Moondrop Stellaris | Planar | 16 Ω | 113 dB | 20-40000 | 9 g | — | No | 2023 | $199 |
| NiceHCK F1 Pro | Planar | 16 Ω | 108 dB | 20-40000 | 10 g | — | No | 2024 | $169 |
| Tangzu Heyday | Planar | 16 Ω | 102 dB | 20-40000 | 9.6 g | — | No | 2023 | $159 |
| LetShuoer S12 Pro | Planar | 20 Ω | 103 dB | 20-40000 | 8.6 g | — | No | 2023 | $149 |
| Kiwi Ears Melody | Planar | 16 Ω | 103 dB | 20-40000 | 10 g | — | No | 2024 | $149 |
| KZ PR2 | Planar | 24 Ω | 102 dB | 20-40000 | 8 g | — | No | 2023 | $79 |
Headphone Reviews · Why this ranking
Five of the seven are 16 Ω loads, so the source is rarely the bottleneck; the differences lie in bass extension, sensitivity and driver size. The 7Hz Timeless is the only model reaching 5 Hz, the Moondrop Stellaris trades on 113 dB sensitivity to be the easiest to drive, the LetShuoer S12 Pro offers the largest diaphragm at 14.8 mm, and the KZ PR2 holds the entry position at 8 g and $79.
Planar magnetic drivers used to be a headphone-only technology: a large diaphragm with low distortion, and no realistic way to fit it inside an ear canal. In-ear designs have matured since, and there are now enough of them on the shelf to fill a ranking. This one keeps to three dimensions you can verify yourself — where the model sits in its brand's line-up, its rated frequency range, and its driver size. Every number below can be checked in the spec table on the corresponding product page.
How we ranked them
There are only three hard requirements: a planar (flat-diaphragm) driver, an in-ear form factor, and publicly stated specs. Ranking looks at positioning first (flagship models ahead), then frequency range and driver size within the same tier. Exactly seven of the 216 models in our database qualify, which means this list involves no judgement calls at all — it is the current planar in-ear shelf, in full.
What it actually takes to drive them
Planar in-ears do not share the headphone version's power demands. A planar over-ear often sits around 300 Ω and wants a desktop amplifier, whereas five of the seven models here run at 16 Ω with sensitivity of 102 dB or higher: a phone and a small dongle are enough for a comfortable level. Sensitivity is the number to watch. At a given impedance, every 3 dB less sensitivity doubles the power needed, so for commuting, favour models that look undemanding in both columns.
- Impedance: 16 Ω is comfortable from a phone; from 24 Ω up, plan on a dongle.
- Sensitivity: 102 dB is the typical figure here — higher means easier to drive.
- Driver size: the 13.2–14.8 mm spread shows up in bass extension and diaphragm area.
- Eartips: planar in-ears react strongly to seal, so fitting the right tips beats changing the cable.
The short version: the 7Hz Timeless goes lowest, the Moondrop Stellaris is the easiest to drive, the LetShuoer S12 Pro has the largest diaphragm, and the KZ PR2 keeps a 13.2 mm planar driver for $79. If you are shopping for planar sound but mostly listen at home, our planar headphone ranking makes a useful companion.