Short answer
Both are audio interfaces, $149 against $130.
The Arturia MiniFuse 2 reaches 100 dB on 562 of the 567 models here, the IK Multimedia AXE I/O ONE on 550.
| Specification | Arturia MiniFuse 2 | IK Multimedia AXE I/O ONE |
|---|---|---|
| Power into 32Ω | 139 mW | 26 mW |
| Power into 150Ω | 45 mW | 13 mW |
| Power into 300Ω | 24 mW | 6.7 mW |
| Power into 600Ω | 12 mW | 3.3 mW |
| Output impedance | 10 Ω | <0.1 Ω |
| Output noise | not published | not published |
| Price | $149 | $130 |
| Headphones it reaches 100 dB on out of 567 | 562 | 550 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Arturia MiniFuse 2 | IK Multimedia AXE I/O ONE |
|---|---|---|
| 32 Ω | Derived | Derived |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Derived | Derived |
Neither column is a maker’s power rating at these loads. Of the 280 sources here, 209 publish a figure at at least one load; these two do not, so every row above is derived — between or beyond the loads each maker did publish, holding output voltage as the maker’s own figures imply. The method understates rather than flatters, but it is still arithmetic rather than a rating.
12 headphones reach 100 dB on the Arturia MiniFuse 2 but not on the IK Multimedia AXE I/O ONE — HiFiMAN HE-6se V2, HiFiMAN HE6 Remastered, HiFiMAN Susvara, 9 more.
510 headphones are left alone by the IK Multimedia AXE I/O ONE under the one-eighth rule but coloured by the Arturia MiniFuse 2 (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Nio, 507 more).
550 of the 567 models here reach 100 dB on both.
Headroom is at a 100 dB SPL peak.
The widest gap on the list is the Shure SE846: Arturia MiniFuse 2 has +30 dB of headroom there against +23 dB. 7 dB is about 5.4 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Arturia MiniFuse 2 and IK Multimedia AXE I/O ONE because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Arturia MiniFuse 2 headroom | IK Multimedia AXE I/O ONE headroom | Arturia MiniFuse 2 hiss | IK Multimedia AXE I/O ONE hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +30 dB damping | +23 dB | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +10 dB damping | +3 dB | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +20 dB damping | +16 dB | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +17 dB | +11 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +11 dB damping | +4 dB | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +10 dB | +4 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +6 dB | +0 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +2 dB damping | -2 dB | not published | not published |
The Arturia MiniFuse 2 costs $19 more than the IK Multimedia AXE I/O ONE. Out of the 567 models here, that difference buys 12 more models driven to 100 dB.
It does not run one way only: the cheaper IK Multimedia AXE I/O ONE leaves 510 models alone under the one-eighth rule that the Arturia MiniFuse 2 does not, which is the part worth checking against your own headphones before paying the difference.
Only published figures count here; blank axes are counted separately.
Each in full: Arturia MiniFuse 2 and IK Multimedia AXE I/O ONE.