Both are dongles, $29 against $20. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?
The FiiO KA11 reaches 100 dB on 566 of the 567 models here, the JadeAudio JA11 on 547.
| Specification | FiiO KA11 | JadeAudio JA11 |
|---|---|---|
| Power into 32Ω | 200 mW | 30 mW |
| Power into 150Ω | 43 mW | 6.4 mW |
| Power into 300Ω | 22 mW | 3.2 mW |
| Power into 600Ω | 11 mW | 1.6 mW |
| Output impedance | 0.7 Ω | 0.5 Ω |
| Output noise | 1.7 µV | 1.7 µV |
| Price | $29 | $20 |
| Headphones it reaches 100 dB on out of 567 | 566 | 547 |
A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.
19 headphones reach 100 dB on the FiiO KA11 but not on the JadeAudio JA11 — Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), HiFiMAN HE-6se V2, 16 more.
3 headphones are left alone by the JadeAudio JA11 under the one-eighth rule but coloured by the FiiO KA11 (Campfire Audio Chimera, Moondrop Armature Art 12, Softears Volume).
547 of the 567 models here reach 100 dB on both. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.
Each has a page of its own with every power figure traced to what the maker published and a full headphone list: FiiO KA11 and JadeAudio JA11. Or put either against your own headphones in the source comparison tool.