AudioScienceReview has headphone measurements, many of which feature sensitivity expressed as mV required to reach 94dB. I’ve converted ASR’s sensitivity measurements, as of the current date (06 January 2022), to the more standard dB/1mW form.
The formula to do this is: Sensitivity in dB/mW = 94dB – 10*log10((mV for 94dB)^2/(Impedance at 1kHz)/1000).
It’s interesting to see how some of the values are very close to the manufacture specs, while others deviate significantly. Or perhaps as another way of looking at it, how many manufacturers advertise headphones as being louder than they actually are in third party testing.
| Name | Impedance (1kHz) | mV for 94dB | dB/mW |
| EMU Teak | 25 | 97 | 98.2439654 |
| Ether CX | 23 | 182 | 92.4158506 |
| ZMF Atticus | 350 | 239 | 101.8727224 |
| AKG K240 55Ω | 57 | 230 | 94.32419184 |
| Audeze LCD 24 | 14 | 130 | 93.18241331 |
| Hifiman HE6SE | 64 | 1370 | 79.3273884 |
| Abyss AB 1266 Phi TC | 49 | 1030 | 80.64521631 |
| Tascam TH-07 | 37 | 113 | 98.62044837 |
| Meze 99 Noir | 18 | 47 | 103.1107679 |
| Sivga Phoenix | 35 | 43 | 106.7713113 |
| Sennheiser HD820 | 350 | 256 | 101.2758811 |
| Hifiman Sundara | 40 | 318 | 89.97205751 |
| Focal Elex | 81 | 180 | 97.97940009 |
| Hifiman Ananda | 33 | 93 | 99.81548043 |
| Focal Utopia | 82 | 189 | 97.60890244 |
| Focal Celestee | 31 | 89 | 99.92581681 |
| Hifiman HE-6 | 50 | 1250 | 79.05149978 |
| PSB M4U | 37 | 59 | 104.264977 |
| ATH-M50X | 39 | 86 | 101.220677 |
| Beyerdynamic T1 | 600 | 370 | 100.417478 |
| Beyerdynamic DT990 250 | 250 | 704 | 91.0279469 |
| AKG K371 | 35 | 65 | 103.1824133 |
| DCA Aeon RT Closed | 13 | 677 | 78.52766015 |
| Abyss Diana V2 | 46 | 631 | 84.62699113 |
| Philips X2HR | 34 | 148 | 95.90955486 |
| Superlux HD688B | 60 | 129 | 99.5697183 |
| NAD HP50 | 39 | 55 | 105.1033923 |
| Sennheiser HD560S | 133 | 246 | 97.41981427 |
| Sony MDR-7506 | 75 | 101 | 102.6641852 |
| Sennheiser HD650 | 310 | 288 | 99.72576718 |
| HEDDPHONE | 41 | 583 | 84.81446747 |
| Verisonix Pro DJ | 9 | 66 | 97.15154638 |
| Audeze LCD-X | 20 | 152 | 93.3734282 |
| Audeze LCD-1 | 15 | 230 | 88.52635587 |
| Oppo PM3 | 26 | 130 | 95.87086643 |
| Sennheiser HD58X | 172 | 166 | 101.9531227 |
| DCA Stealth | 23 | 549 | 82.82583147 |
| Koss Pro 4AA | 250 | 162 | 103.7890998 |
| Neumann NDH20 | 167 | 159 | 102.1992222 |
| Kennerton Rognir | 38 | 143 | 96.69111522 |
| Audeze Sine | 22 | 139 | 94.5639308 |
| Beyerdynamic Amiron Home | 250 | 212 | 101.4526829 |
| Hifiman Arya | 30 | 214 | 92.16293708 |
| Focal Elegia | 30 | 82 | 100.4949355 |
| Focal Stellia | 33 | 96 | 99.53971474 |
| AKG K712 Pro | 62 | 207 | 95.60450999 |
| Hifiman HE400SE | 25 | 328 | 87.66192321 |
| Hifiman HE-560 V4 | 39 | 420 | 87.44566026 |
| Meze Liric | 30 | 204 | 92.5786092 |