The Symphonium Crimson is 6.05Ω at 83.8 dB/mW; the Symphonium Meteor is 9.7Ω at 90.9 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Crimson needs 7.1 dB more than the Meteor to reach the same loudness — 42 mW against 8.1 mW.
| Specification | Crimson | Meteor |
|---|---|---|
| Impedance | 6.05 Ω | 9.7 Ω |
| Sensitivity | 83.8 dB/mW | 90.9 dB/mW |
| Sensitivity (voltage) | 106.0 dB/V | 111.0 dB/V |
| Power for 100 dB | 42 mW | 8.1 mW |
| Voltage for 100 dB | 0.50 V | 0.28 V |
| Current for 100 dB | 83.0 mA | 28.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 0.76 Ω | 1.21 Ω |
| Sources that reach 100 dB out of 280 | 166 | 271 |
105 of the 280 sources have the power for the Meteor but not for the Crimson — Apple USB-C dongle (US), Generic CX31993 dongles, JadeAudio JA11, 102 more.
41 sources are low enough in output impedance for the Meteor under the one-eighth rule but not for the Crimson (FiiO SnowSky Tiny B, FiiO KA15, FiiO BTR15, 38 more).
166 of the 280 sources here reach 100 dB on both.
The Crimson is more demanding than 96% of the 567 non-electrostatic models in this database; the Meteor than 71%.
| dB SPL | Crimson power | Crimson voltage | Meteor power | Meteor voltage |
|---|---|---|---|---|
| 80 | 0.42 mW | 50 mV | 0.08 mW | 28 mV |
| 85 | 1.3 mW | 89 mV | 0.26 mW | 50 mV |
| 90 | 4.2 mW | 0.16 V | 0.81 mW | 89 mV |
| 95 | 13 mW | 0.28 V | 2.6 mW | 0.16 V |
| 100 | 42 mW | 0.50 V | 8.1 mW | 0.28 V |
| 105 | 132 mW | 0.89 V | 26 mW | 0.50 V |
| Source | Price | Headroom, Crimson | Headroom, Meteor | Output impedance | Noise |
|---|---|---|---|---|---|
| FiiO KA11 | $29 | 3.5 dB | 12.6 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 0.4 dB | 9.5 dB | 0.6 Ω | 1.0 µV |
| FiiO KA3 | $79 | 0.4 dB | 9.5 dB | 0.5 Ω | 1.7 µV |
Of the 280 sources here, 166 reach 100 dB on both. 41 of them also publish an output impedance low enough for both under the one-eighth rule and a noise figure that stays below the audible-hiss threshold with both.
The cheapest of the 41 is the FiiO KA11, at $29. It leaves 3.5 dB of headroom on the Crimson and 12.6 dB on the Meteor, its output impedance is 0.7 Ω against a one-eighth limit of 0.76 Ω and 1.21 Ω, and its noise figure puts the hiss floor 29 dB and 24 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| Crimson | 10Hz - 24kHz, ± 2 dB | ±2 dB | not printed |
| Meteor | 12Hz - 21kHz, ± 3 dB | ±3 dB | not printed |
Symphonium prints 10Hz - 24kHz, ± 2 dB for the Crimson and 12Hz - 21kHz, ± 3 dB for the Meteor.
Both sheets print a tolerance, which is rare enough to be worth pointing at: only 58 of the 490 models with a printed range do. These two ranges can be set against each other, because each of them says how far down the response is allowed to be at the ends.
Not a measurement; maker by maker.
Both have a page of their own. In full: Symphonium Crimson and Symphonium Meteor. Every figure on this page comes from what Symphonium published, or is derived from it — what that maker publishes, counted.