The Audeze LCD-X 2021 is 20Ω at 103.0 dB/mW; the Focal Utopia is 80Ω at 104.0 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-X 2021 needs 1.0 dB more than the Focal Utopia to reach the same loudness — 0.50 mW against 0.40 mW.
| Specification | Audeze LCD-X 2021 | Focal Utopia |
|---|---|---|
| Impedance | 20 Ω | 80 Ω |
| Sensitivity | 103.0 dB/mW | 104.0 dB/mW |
| Sensitivity (voltage) | 120.0 dB/V | 115.0 dB/V |
| Power for 100 dB | 0.50 mW | 0.40 mW |
| Voltage for 100 dB | 0.10 V | 0.18 V |
| Current for 100 dB | 5.0 mA | 2.2 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.50 Ω | 10.00 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
Every source in the database that drives one of them drives the other. On power, the choice between these two changes nothing about what amplifier you need.
10 sources are low enough in output impedance for the Focal Utopia under the one-eighth rule but not for the Audeze LCD-X 2021 (Zoom AMS-22, Arturia MiniFuse 2, Arturia MiniFuse 1, 7 more).
280 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: Audeze LCD-X 2021 and Focal Utopia. Every figure on this page comes from what Audeze and Focal published, or is derived from it — what Audeze publishes and what Focal publishes, both counted.