The Campfire Audio Andromeda 2023 is 6.375Ω at 110.6 dB/mW; the Campfire Audio Solaris 2020 is 15Ω at 94.0 dB (no figure from the maker at all). 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 Solaris 2020 needs 16.6 dB more than the Andromeda 2023 to reach the same loudness — 4.0 mW against 0.09 mW.
| Specification | Andromeda 2023 | Solaris 2020 |
|---|---|---|
| Impedance | 6.375 Ω | 15 Ω |
| Sensitivity | 110.6 dB/mW | 94.0 dB |
| Sensitivity (voltage) | 132.6 dB/V | 112.2 dB/V |
| Power for 100 dB | 0.09 mW | 4.0 mW |
| Voltage for 100 dB | 24 mV | 0.24 V |
| Current for 100 dB | 3.7 mA | 16.3 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 0.80 Ω | 1.88 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. For Campfire Audio Solaris 2020 the maker publishes no sensitivity figure at all. The number in the table was collected when this database was first built and has never been traced to a manufacturer document, so treat every row below it as an estimate rather than a specification.
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.
46 sources are low enough in output impedance for the Solaris 2020 under the one-eighth rule but not for the Andromeda 2023 (FiiO SnowSky Tiny B, FiiO KA13, FiiO KA15, 43 more).
32 sources stay below the audible-hiss threshold with the Solaris 2020 but cross it with the Andromeda 2023 (Kiwi Ears Allegro Mini, FiiO BTR11, FiiO KA13, 29 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: Campfire Audio Andromeda 2023 and Campfire Audio Solaris 2020. Each figure on this page is labelled on those pages with where it came from, including the ones Campfire Audio never published — what that maker publishes, counted.