The Kinera Freya Vanir is 16Ω at 88.0 dB/mW; the Kinera Mimisbrunnr is 43Ω at 88.3 dB/mW. This page is only about what they ask of an amplifier — not how they sound, which no specification on either sheet can tell you.
In amplifier terms these two are the same headphone. The gap between what they need for 100 dB is under half a decibel, which is smaller than the step between two clicks of most volume controls.
| Specification | Freya Vanir | Mimisbrunnr |
|---|---|---|
| Impedance | 16 Ω | 43 Ω |
| Sensitivity | 88.0 dB/mW | 88.3 dB/mW |
| Sensitivity (voltage) | 106.0 dB/V | 102.0 dB/V |
| Power for 100 dB | 16 mW | 15 mW |
| Voltage for 100 dB | 0.50 V | 0.80 V |
| Current for 100 dB | 31.5 mA | 18.5 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.00 Ω | 5.38 Ω |
| Sources that reach 100 dB out of 280 | 262 | 277 |
1 of the 280 sources has the power for the Freya Vanir but not for the Mimisbrunnr — Sony NW-A306.
16 of the 280 sources have the power for the Mimisbrunnr but not for the Freya Vanir — Apple USB-C dongle (US), JadeAudio JA11, Kiwi Ears Allegro Mini, 13 more.
1 source is low enough in output impedance for the Mimisbrunnr under the one-eighth rule but not for the Freya Vanir (Shanling H5).
261 of the 280 sources here reach 100 dB on both. That count is about power only — the output-impedance and hiss lines above are separate questions, and a source can pass this one and fail those.
Each model has a page of its own with the full source list, the hiss estimate and the provenance of every figure above: Kinera Freya Vanir and Kinera Mimisbrunnr. Every figure on this page comes from what Kinera published, or is derived from it — what that maker publishes, counted.