The Kiwi Ears Orchestra II is 15Ω at 110.0 dB/mW; the Kiwi Ears Stardust is 13Ω at 107.0 dB (no reference unit printed). 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 Stardust needs 3.0 dB more than the Orchestra II to reach the same loudness — 0.20 mW against 0.10 mW.
| Specification | Orchestra II | Stardust |
|---|---|---|
| Impedance | 15 Ω | 13 Ω |
| Sensitivity | 110.0 dB/mW | 107.0 dB |
| Sensitivity (voltage) | 128.2 dB/V | 125.9 dB/V |
| Power for 100 dB | 0.10 mW | 0.20 mW |
| Voltage for 100 dB | 39 mV | 51 mV |
| Current for 100 dB | 2.6 mA | 3.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 1.88 Ω | 1.62 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. Kiwi Ears Stardust printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, that model needs far more than the table says. Why the two readings differ by so much.
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.
2 sources are low enough in output impedance for the Orchestra II under the one-eighth rule but not for the Stardust (FiiO KA13, Schiit Vali 2+).
3 sources stay below the audible-hiss threshold with the Stardust but cross it with the Orchestra II (Grace Design m900, FiiO K17, FiiO M27).
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: Kiwi Ears Orchestra II and Kiwi Ears Stardust. Each figure on this page is labelled on those pages with where it came from, including the ones Kiwi Ears never published — what that maker publishes, counted.