The AKG K371 is 32Ω at 99.1 dB/mW; the Audeze LCD-5 is 14Ω at 90.0 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.
The Audeze LCD-5 needs 9.1 dB more than the AKG K371 to reach the same loudness — 10 mW against 1.2 mW.
| Specification | AKG K371 | Audeze LCD-5 |
|---|---|---|
| Impedance | 32 Ω | 14 Ω |
| Sensitivity | 99.1 dB/mW | 90.0 dB/mW |
| Sensitivity (voltage) | 114.0 dB/V | 108.5 dB/V |
| Power for 100 dB | 1.2 mW | 10 mW |
| Voltage for 100 dB | 0.20 V | 0.37 V |
| Current for 100 dB | 6.2 mA | 26.7 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 4.00 Ω | 1.75 Ω |
| Sources that reach 100 dB out of 280 | 280 | 274 |
6 of the 280 sources have the power for the AKG K371 but not for the Audeze LCD-5 — Apple USB-C dongle (EU), Zoom AMS-22, Steinberg UR22C, 3 more.
4 sources are low enough in output impedance for the AKG K371 under the one-eighth rule but not for the Audeze LCD-5 (Schiit Vali 2+, Astell&Kern HC3, RME Fireface UFX II, 1 more).
274 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: AKG K371 and Audeze LCD-5. Every figure on this page comes from what AKG and Audeze published, or is derived from it — what AKG publishes and what Audeze publishes, both counted.