The Dan Clark Audio Stealth is 23Ω at 90.0 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 Dan Clark Audio Stealth needs 22.0 dB more than the Meze 109 Pro to reach the same loudness — 10 mW against 0.06 mW.
| Specification | Dan Clark Audio Stealth | Meze 109 Pro |
|---|---|---|
| Impedance | 23 Ω | 40 Ω |
| Sensitivity | 90.0 dB/mW | 112.0 dB/mW |
| Sensitivity (voltage) | 106.4 dB/V | 126.0 dB/V |
| Power for 100 dB | 10 mW | 0.06 mW |
| Voltage for 100 dB | 0.48 V | 50 mV |
| Current for 100 dB | 20.9 mA | 1.3 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.88 Ω | 5.00 Ω |
| Sources that reach 100 dB out of 280 | 279 | 280 |
1 of the 280 sources has the power for the Meze 109 Pro but not for the Dan Clark Audio Stealth — Steinberg UR22C.
1 source is low enough in output impedance for the Meze 109 Pro under the one-eighth rule but not for the Dan Clark Audio Stealth (Shanling H5).
13 sources stay below the audible-hiss threshold with the Dan Clark Audio Stealth but cross it with the Meze 109 Pro (FiiO BTR11, FiiO K11 R2R, Lake People G103-S Mk II, 10 more).
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 Stealth and Meze 109 Pro. 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.