The NiceHCK F1 Pro is 16Ω at 104.0 dB/mW; the NiceHCK Himalaya is 22Ω at 110.0 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 F1 Pro needs 6.0 dB more than the Himalaya to reach the same loudness — 0.40 mW against 0.10 mW.
| Specification | F1 Pro | Himalaya |
|---|---|---|
| Impedance | 16 Ω | 22 Ω |
| Sensitivity | 104.0 dB/mW | 110.0 dB/mW |
| Sensitivity (voltage) | 122.0 dB/V | 126.6 dB/V |
| Power for 100 dB | 0.40 mW | 0.10 mW |
| Voltage for 100 dB | 80 mV | 47 mV |
| Current for 100 dB | 5.0 mA | 2.1 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.00 Ω | 2.75 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
Every source in the database that drives one of them drives the other. On power, the choice between these two changes nothing about what amplifier you need.
13 sources stay below the audible-hiss threshold with the F1 Pro but cross it with the Himalaya (FiiO K11 R2R, Lake People G103-S Mk II, Lake People G111 Mk II, 10 more).
280 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: NiceHCK F1 Pro and NiceHCK Himalaya. Each figure on this page is labelled on those pages with where it came from, including the ones NiceHCK never published — what that maker publishes, counted.