The Symphonium Crimson is 6.05Ω at 83.8 dB/mW; the Symphonium Zenith is 6.1Ω at 85.9 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 Crimson needs 2.1 dB more than the Zenith to reach the same loudness — 42 mW against 26 mW.
| Specification | Crimson | Zenith |
|---|---|---|
| Impedance | 6.05 Ω | 6.1 Ω |
| Sensitivity | 83.8 dB/mW | 85.9 dB/mW |
| Sensitivity (voltage) | 106.0 dB/V | 108.0 dB/V |
| Power for 100 dB | 42 mW | 26 mW |
| Voltage for 100 dB | 0.50 V | 0.40 V |
| Current for 100 dB | 83.0 mA | 64.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 0.76 Ω | 0.76 Ω |
| Sources that reach 100 dB out of 280 | 166 | 197 |
31 of the 280 sources have the power for the Zenith but not for the Crimson — FiiO SnowSky Tiny B, Tanchjim Stargate II, ddHiFi TC35Air, 28 more.
166 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: Symphonium Crimson and Symphonium Zenith. Every figure on this page comes from what Symphonium published, or is derived from it — what that maker publishes, counted.