The Moondrop JOKER is 68Ω at 94.3 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 PARA 2 needs 8.8 dB more than the JOKER to reach the same loudness — 28 mW against 3.7 mW.
| Specification | JOKER | PARA 2 |
|---|---|---|
| Impedance | 68 Ω | 9 Ω |
| Sensitivity | 94.3 dB/mW | 85.5 dB/mW |
| Sensitivity (voltage) | 106.0 dB/V | 106.0 dB/V |
| Power for 100 dB | 3.7 mW | 28 mW |
| Voltage for 100 dB | 0.50 V | 0.50 V |
| Current for 100 dB | 7.4 mA | 56.0 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 8.50 Ω | 1.12 Ω |
| Sources that reach 100 dB out of 280 | 280 | 223 |
57 of the 280 sources have the power for the JOKER but not for the PARA 2 — Apple USB-C dongle (US), Apple USB-C dongle (EU), Generic CX31993 dongles, 54 more.
12 sources are low enough in output impedance for the JOKER under the one-eighth rule but not for the PARA 2 (FiiO KA13, FiiO K11, Schiit Vali 2+, 9 more).
223 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 JOKER and Moondrop PARA 2. Every figure on this page comes from what Moondrop published, or is derived from it — what that maker publishes, counted.