Both are dongles, $29 against $24. 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 Kiwi Ears Allegro Mini on 547.
| Specification | FiiO KA11 | Kiwi Ears Allegro Mini |
|---|---|---|
| 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 | not published |
| Output noise | 1.7 µV | 3.0 µV |
| Price | $29 | $24 |
| 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 Kiwi Ears Allegro Mini — Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), HiFiMAN HE-6se V2, 16 more.
16 headphones stay below the audible-hiss threshold on the FiiO KA11 but cross it on the Kiwi Ears Allegro Mini (64 Audio Fourte, Campfire Audio Andromeda 10, Campfire Audio Andromeda 2023, 13 more).
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 Kiwi Ears Allegro Mini. Or put either against your own headphones in the source comparison tool.