The Symphonium Crimson is 6.05Ω at 83.8 dB/mW; the Symphonium Giant is 7.0Ω at 88.5 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The Crimson needs 4.7 dB more than the Giant to reach the same loudness — 42 mW against 14 mW.
| Specification | Crimson | Giant |
|---|---|---|
| Impedance | 6.05 Ω | 7.0 Ω |
| Sensitivity | 83.8 dB/mW | 88.5 dB/mW |
| Sensitivity (voltage) | 106.0 dB/V | 110.0 dB/V |
| Power for 100 dB | 42 mW | 14 mW |
| Voltage for 100 dB | 0.50 V | 0.31 V |
| Current for 100 dB | 83.0 mA | 44.9 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 0.76 Ω | 0.88 Ω |
| Sources that reach 100 dB out of 280 | 166 | 252 |
86 of the 280 sources have the power for the Giant but not for the Crimson — FiiO SnowSky Tiny A, FiiO SnowSky Tiny B, FiiO BTR11, 83 more.
3 sources are low enough in output impedance for the Giant under the one-eighth rule but not for the Crimson (FiiO KA15, Shanling UA5, FiiO M33 R2R).
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 Giant than 76%.
| dB SPL | Crimson power | Crimson voltage | Giant power | Giant voltage |
|---|---|---|---|---|
| 80 | 0.42 mW | 50 mV | 0.14 mW | 31 mV |
| 85 | 1.3 mW | 89 mV | 0.45 mW | 56 mV |
| 90 | 4.2 mW | 0.16 V | 1.4 mW | 99 mV |
| 95 | 13 mW | 0.28 V | 4.5 mW | 0.18 V |
| 100 | 42 mW | 0.50 V | 14 mW | 0.31 V |
| 105 | 132 mW | 0.89 V | 45 mW | 0.56 V |
| Source | Price | Headroom, Crimson | Headroom, Giant | Output impedance | Noise |
|---|---|---|---|---|---|
| FiiO KA11 | $29 | 3.5 dB | 8.8 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 0.4 dB | 5.7 dB | 0.6 Ω | 1.0 µV |
| FiiO KA3 | $79 | 0.4 dB | 5.7 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 8.8 dB on the Giant, its output impedance is 0.7 Ω against a one-eighth limit of 0.76 Ω and 0.88 Ω, and its noise figure puts the hiss floor 29 dB and 25 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 |
| Giant | 5Hz - 18kHz, ± 2 dB | ±2 dB | not printed |
Symphonium prints 10Hz - 24kHz, ± 2 dB for the Crimson and 5Hz - 18kHz, ± 2 dB for the Giant.
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 Giant. Every figure on this page comes from what Symphonium published, or is derived from it — what that maker publishes, counted.