The FiiO FA19 is 10Ω at 106.0 dB/mW; the FiiO FP3 is 36Ω at 105.0 dB/mW. This page covers what they ask of an amplifier, not how they sound.
The FP3 needs 1.0 dB more than the FA19 to reach the same loudness — 0.32 mW against 0.25 mW.
| Specification | FA19 | FP3 |
|---|---|---|
| Impedance | 10 Ω | 36 Ω |
| Sensitivity | 106.0 dB/mW | 105.0 dB/mW |
| Sensitivity (voltage) | 126.0 dB/V | 119.4 dB/V |
| Power for 100 dB | 0.25 mW | 0.32 mW |
| Voltage for 100 dB | 50 mV | 0.11 V |
| Current for 100 dB | 5.0 mA | 3.0 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 1.25 Ω | 4.50 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
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.
8 sources are low enough in output impedance for the FP3 under the one-eighth rule but not for the FA19 (FiiO KA13, Schiit Vali 2+, Astell&Kern HC3, 5 more).
14 sources stay below the audible-hiss threshold with the FP3 but cross it with the FA19 (FiiO BTR11, FiiO K11 R2R, Lake People G103-S Mk II, 11 more).
280 of the 280 sources here reach 100 dB on both.
The FP3 is more demanding than 35% of the 567 non-electrostatic models in this database; the FA19 than 11%.
| dB SPL | FA19 power | FA19 voltage | FP3 power | FP3 voltage |
|---|---|---|---|---|
| 80 | 2.5 µW | 5 mV | 3.2 µW | 11 mV |
| 85 | 7.9 µW | 9 mV | 0.01 mW | 19 mV |
| 90 | 0.03 mW | 16 mV | 0.03 mW | 34 mV |
| 95 | 0.08 mW | 28 mV | 0.10 mW | 60 mV |
| 100 | 0.25 mW | 50 mV | 0.32 mW | 0.11 V |
| 105 | 0.79 mW | 89 mV | 1.0 mW | 0.19 V |
| Source | Price | Headroom, FA19 | Headroom, FP3 | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 15.7 dB | 19.3 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 27.9 dB | 27.5 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 24.8 dB | 24.5 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 53 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 53 is the JadeAudio JA11, at $20. It leaves 15.7 dB of headroom on the FA19 and 19.3 dB on the FP3, its output impedance is 0.5 Ω against a one-eighth limit of 1.25 Ω and 4.50 Ω, and its noise figure puts the hiss floor 9 dB and 16 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| FA19 | 20Hz-40kHz | not printed | not printed |
| FP3 | 10Hz-40kHz | not printed | not printed |
FiiO prints 20Hz-40kHz for the FA19 and 10Hz-40kHz for the FP3.
Neither range has a tolerance printed beside it, so a wider range on one sheet is not deeper bass or more treble.
Not a measurement; maker by maker.
Both have a page of their own. In full: FiiO FA19 and FiiO FP3. Every figure on this page comes from what FiiO published, or is derived from it — what that maker publishes, counted.