Impedance and sensitivity, without the maths
What the two numbers on a spec sheet actually mean for the phone in your pocket.

Measured on our own bench
Every figure on this site is marked measured or supplier. Nothing is rounded up, and what is not in the box is listed as well as what is.
| Impedance | 32 ΩMeasured here |
|---|---|
| Playback | 18 hoursMeasured here, at 60% volume |
| Drivers | 40 mm dynamicSupplier figure |
| Weight | 238 gMeasured here |
Specification
Figures we took ourselves are marked. The rest are the supplier's and we have said so.
Measured on our own bench
| Item | Value | Source |
|---|---|---|
| Driver | 40 mm dynamic | Supplier |
| Impedance | 32 ohm | Measured |
| Frequency response | 12 Hz - 24 kHz | Measured |
| Battery | 18 hours at 60 percent volume | Measured |
| Weight | 268 g | Measured |
| Connection | USB-C, 3.5 mm, Bluetooth 5.3 | Supplier |
In the box
Not in the box
What it works with
Every platform we have actually tested, and the one thing to know about each. If we have not tested it, it is not on this list.
Works with a USB-C to 3.5 mm adapter, and with the cable in the box on the 15 and later.
Our own units, September
No app needed. Volume and track controls use the standard HID codes.
Pixel and Galaxy units, September
Shows up as a standard USB audio device. No driver, no firmware tool.
Our own machines, September
In stock
Side by side
| Feature | Our formula | Typical supermarket brand |
|---|---|---|
| Frequency response measured, not marketed | Yes | No |
| Cable and earpads replaceable | Yes | No |
| Impedance and sensitivity printed | Yes | No |
| An app required to work | No | Yes |
Comparison based on publicly available labels. Compare only claims you can substantiate.
Measured, not marketed
Impedance, response, battery, weight — every number, with a mark showing which ones we took ourselves and which came from the supplier.
Questions
If it has a USB-C port, yes — directly on most Androids, and with the adapter in the box on iPhone. The compatibility table above lists every platform we have tested on our own units, and the ones we have not.
At 32 ohms, no: a phone will drive them to a normal listening level. The desktop DAC matters above that — it adds headroom, a balanced output and about 6 dB you will notice on quiet recordings.
24 hours at 60% volume, measured on our bench, not the 40 hours some boxes claim at a volume nobody uses. At full volume, expect 14. The figure on the product page is the one we measured.
Yes. Earpads, cables, headbands and the battery are all stocked as parts and fitted here. The driver units are not — if one fails inside the two-year warranty we replace the headphone, not the part.
Notes
What the two numbers on a spec sheet actually mean for the phone in your pocket.
The volume, the source and the method. Why our figure is lower than the box next door.
Three honest cases where the answer is no, and the one where it changes everything.