The Moondrop COSMO is 15Ω at 81.8 dB/mW; the Moondrop PARA 2 is 9Ω at 85.5 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 COSMO needs 3.7 dB more than the PARA 2 to reach the same loudness — 66 mW against 28 mW.
| Specification | COSMO | PARA 2 |
|---|---|---|
| Impedance | 15 Ω | 9 Ω |
| Sensitivity | 81.8 dB/mW | 85.5 dB/mW |
| Sensitivity (voltage) | 100.0 dB/V | 106.0 dB/V |
| Power for 100 dB | 66 mW | 28 mW |
| Voltage for 100 dB | 1.00 V | 0.50 V |
| Current for 100 dB | 66.4 mA | 56.0 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 1.88 Ω | 1.12 Ω |
| Sources that reach 100 dB out of 280 | 188 | 223 |
35 of the 280 sources have the power for the PARA 2 but not for the COSMO — FiiO SnowSky Tiny B, Fosi Audio N3, Truthear SHIO, 32 more.
8 sources are low enough in output impedance for the COSMO under the one-eighth rule but not for the PARA 2 (FiiO KA13, FiiO K11, Schiit Vali 2+, 5 more).
188 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: Moondrop COSMO and Moondrop PARA 2. Every figure on this page comes from what Moondrop published, or is derived from it — what that maker publishes, counted.