The Dan Clark Audio Expanse is 26Ω at 90.0 dB/mW; the Meze 99 Classics is 32Ω at 103.0 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 Dan Clark Audio Expanse needs 13.0 dB more than the Meze 99 Classics to reach the same loudness — 10 mW against 0.50 mW.
| Specification | Dan Clark Audio Expanse | Meze 99 Classics |
|---|---|---|
| Impedance | 26 Ω | 32 Ω |
| Sensitivity | 90.0 dB/mW | 103.0 dB/mW |
| Sensitivity (voltage) | 105.9 dB/V | 117.9 dB/V |
| Power for 100 dB | 10 mW | 0.50 mW |
| Voltage for 100 dB | 0.51 V | 0.13 V |
| Current for 100 dB | 19.6 mA | 4.0 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 3.25 Ω | 4.00 Ω |
| Sources that reach 100 dB out of 280 | 279 | 280 |
1 of the 280 sources has the power for the Meze 99 Classics but not for the Dan Clark Audio Expanse — Steinberg UR22C.
279 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: Dan Clark Audio Expanse and Meze 99 Classics. Every figure on this page comes from what Dan Clark Audio and Meze published, or is derived from it — what Dan Clark Audio publishes and what Meze publishes, both counted.