The Moondrop Old Fashioned is 32Ω at 94.1 dB/mW; the Moondrop PARA is 8Ω at 80.0 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 PARA needs 14.1 dB more than the Old Fashioned to reach the same loudness — 100 mW against 3.9 mW.
| Specification | Old Fashioned | PARA |
|---|---|---|
| Impedance | 32 Ω | 8 Ω |
| Sensitivity | 94.1 dB/mW | 80.0 dB/mW |
| Sensitivity (voltage) | 109.0 dB/V | 101.0 dB/V |
| Power for 100 dB | 3.9 mW | 100 mW |
| Voltage for 100 dB | 0.35 V | 0.89 V |
| Current for 100 dB | 11.0 mA | 111.8 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 4.00 Ω | 1.00 Ω |
| Sources that reach 100 dB out of 280 | 280 | 130 |
150 of the 280 sources have the power for the Old Fashioned but not for the PARA — Apple USB-C dongle (US), Apple USB-C dongle (EU), Generic CX31993 dongles, 147 more.
12 sources are low enough in output impedance for the Old Fashioned under the one-eighth rule but not for the PARA (FiiO KA13, FiiO K11, Schiit Vali 2+, 9 more).
130 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 Old Fashioned and Moondrop PARA. Every figure on this page comes from what Moondrop published, or is derived from it — what that maker publishes, counted.