The NiceHCK DB2 is 16Ω at 107.0 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 DB2 needs 3.0 dB more than the Himalaya to reach the same loudness — 0.20 mW against 0.10 mW.
| Specification | DB2 | Himalaya |
|---|---|---|
| Impedance | 16 Ω | 22 Ω |
| Sensitivity | 107.0 dB/mW | 110.0 dB/mW |
| Sensitivity (voltage) | 125.0 dB/V | 126.6 dB/V |
| Power for 100 dB | 0.20 mW | 0.10 mW |
| Voltage for 100 dB | 57 mV | 47 mV |
| Current for 100 dB | 3.5 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.
7 sources stay below the audible-hiss threshold with the DB2 but cross it with the Himalaya (Grace Design m900, FiiO M33 R2R, FiiO K17, 4 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 DB2 and NiceHCK Himalaya. Every figure on this page comes from what NiceHCK published, or is derived from it — what that maker publishes, counted.