Short answer
Both are dongles, $20 against $24.
On raw power they are level: each reaches 100 dB on 547 of the 567 non-electrostatic models here.
| Specification | JadeAudio JA11 | Kiwi Ears Allegro Mini |
|---|---|---|
| Power into 32Ω | 30 mW | 30 mW |
| Power into 150Ω | 6.4 mW | 6.4 mW |
| Power into 300Ω | 3.2 mW | 3.2 mW |
| Power into 600Ω | 1.6 mW | 1.6 mW |
| Output impedance | 0.5 Ω | not published |
| Output noise | 1.7 µV | 3.0 µV |
| Price | $20 | $24 |
| Headphones it reaches 100 dB on out of 567 | 547 | 547 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | JadeAudio JA11 | Kiwi Ears Allegro Mini |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Derived | Derived |
Both makers publish a power rating. JadeAudio JA11 publishes at 32 Ω; Kiwi Ears Allegro Mini at 32 Ω. The other rows are worked out from those.
The two publish at the same loads, which is the one case where the rows of this table can be read straight across.
On power they are interchangeable across this whole database: there is no headphone here that one reaches 100 dB on and the other does not.
16 headphones stay below the audible-hiss threshold on the JadeAudio JA11 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.
Headroom is at a 100 dB SPL peak.
Across all eight the two stay within half a decibel of each other, which is a way of saying that on power this pair is one product.
Hiss below about 20 dB SPL is inaudible in a quiet room.
| Headphone | Impedance | Needs | JadeAudio JA11 headroom | Kiwi Ears Allegro Mini headroom | JadeAudio JA11 hiss | Kiwi Ears Allegro Mini hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +23 dB | +23 dB | 19 dB | 24 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +3 dB | +3 dB | -1 dB | 4 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +12 dB | +12 dB | -3 dB | 2 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +8 dB | +8 dB | -7 dB | -2 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +5 dB | +5 dB | -8 dB | -3 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +1 dB | +1 dB | -14 dB | -9 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | -3 dB | -3 dB | -18 dB | -13 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | -5 dB | -5 dB | -20 dB | -15 dB |
The Kiwi Ears Allegro Mini costs $4 more than the JadeAudio JA11, and on these three axes the money buys nothing: among the 567 models here there is not one that the Kiwi Ears Allegro Mini handles and the JadeAudio JA11 does not — not on power, not on the one-eighth rule, not on hiss. The traffic runs the other way: the cheaper JadeAudio JA11 keeps 16 models below the audible-hiss threshold that the Kiwi Ears Allegro Mini does not.
Only published figures count here; blank axes are counted separately.
Each in full: JadeAudio JA11 and Kiwi Ears Allegro Mini.