The HiFiMAN Deva Pro is 18Ω at 93.5 dB (no reference unit printed); the HiFiMAN Edition XV is 12Ω at 92.0 dB (no reference unit printed). This page is only about what they ask of an amplifier — not how they sound, which no specification on either sheet can tell you.
The Edition XV needs 1.5 dB more than the Deva Pro to reach the same loudness — 6.3 mW against 4.5 mW.
| Specification | Deva Pro | Edition XV |
|---|---|---|
| Impedance | 18 Ω | 12 Ω |
| Sensitivity | 93.5 dB | 92.0 dB |
| Sensitivity (voltage) | 110.9 dB/V | 111.2 dB/V |
| Power for 100 dB | 4.5 mW | 6.3 mW |
| Voltage for 100 dB | 0.28 V | 0.28 V |
| Current for 100 dB | 15.8 mA | 22.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.25 Ω | 1.50 Ω |
| Sources that reach 100 dB out of 280 | 280 | 278 |
One caution before reading the rows. HiFiMAN Deva Pro and HiFiMAN Edition XV printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, each of them needs far more than the table says. Why the two readings differ by so much.
2 of the 280 sources have the power for the Deva Pro but not for the Edition XV — Apple USB-C dongle (EU), Steinberg UR22C.
5 sources are low enough in output impedance for the Deva Pro under the one-eighth rule but not for the Edition XV (FiiO KA13, Schiit Vali 2+, Astell&Kern HC3, 2 more).
278 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: HiFiMAN Deva Pro and HiFiMAN Edition XV. Each figure on this page is labelled on those pages with where it came from, including the ones HiFiMAN never published — what that maker publishes, counted.