The Focal Utopia is 80Ω at 104.0 dB/mW; the Meze 109 Pro is 40Ω at 112.0 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 Focal Utopia needs 8.0 dB more than the Meze 109 Pro to reach the same loudness — 0.40 mW against 0.06 mW.
| Specification | Focal Utopia | Meze 109 Pro |
|---|---|---|
| Impedance | 80 Ω | 40 Ω |
| Sensitivity | 104.0 dB/mW | 112.0 dB/mW |
| Sensitivity (voltage) | 115.0 dB/V | 126.0 dB/V |
| Power for 100 dB | 0.40 mW | 0.06 mW |
| Voltage for 100 dB | 0.18 V | 50 mV |
| Current for 100 dB | 2.2 mA | 1.3 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 10.00 Ω | 5.00 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.
9 sources are low enough in output impedance for the Focal Utopia under the one-eighth rule but not for the Meze 109 Pro (Zoom AMS-22, Arturia MiniFuse 2, Arturia MiniFuse 1, 6 more).
13 sources stay below the audible-hiss threshold with the Focal Utopia but cross it with the Meze 109 Pro (FiiO BTR11, FiiO K11 R2R, Lake People G103-S Mk II, 10 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: Focal Utopia and Meze 109 Pro. Every figure on this page comes from what Focal and Meze published, or is derived from it — what Focal publishes and what Meze publishes, both counted.