The Focal Clear is 55Ω at 104.0 dB/mW; the Focal Stellia is 35Ω at 106.0 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 Clear needs 2.0 dB more than the Stellia to reach the same loudness — 0.40 mW against 0.25 mW.
| Specification | Clear | Stellia |
|---|---|---|
| Impedance | 55 Ω | 35 Ω |
| Sensitivity | 104.0 dB/mW | 106.0 dB/mW |
| Sensitivity (voltage) | 116.6 dB/V | 120.6 dB/V |
| Power for 100 dB | 0.40 mW | 0.25 mW |
| Voltage for 100 dB | 0.15 V | 94 mV |
| Current for 100 dB | 2.7 mA | 2.7 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 6.88 Ω | 4.38 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.
1 source is low enough in output impedance for the Clear under the one-eighth rule but not for the Stellia (Shanling H5).
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 Clear and Focal Stellia. Every figure on this page comes from what Focal published, or is derived from it — what that maker publishes, counted.