Short answer
Both are audio interfaces, $149 against $139.
The Arturia MiniFuse 1 reaches 100 dB on 562 of the 567 models here, the Focusrite Scarlett Solo 4th gen on 552.
| Specification | Arturia MiniFuse 1 | Focusrite Scarlett Solo 4th gen |
|---|---|---|
| Power into 32Ω | 139 mW | 31 mW |
| Power into 150Ω | 45 mW | 19 mW |
| Power into 300Ω | 24 mW | 22 mW |
| Power into 600Ω | 12 mW | 11 mW |
| Output impedance | 10 Ω | 50 Ω |
| Output noise | not published | not published |
| Price | $149 | $139 |
| Headphones it reaches 100 dB on out of 567 | 562 | 552 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Arturia MiniFuse 1 | Focusrite Scarlett Solo 4th gen |
|---|---|---|
| 32 Ω | Derived | Derived |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Published |
| 600 Ω | Derived | Derived |
Only one of these two columns starts from a power rating. Focusrite Scarlett Solo 4th gen publishes one at 300 Ω; Arturia MiniFuse 1 publishes none at any of these four loads, so its column is worked out from power it published at other loads. Both are arithmetic on a maker’s own figures rather than guesses, and the method used for the Arturia MiniFuse 1 understates rather than flatters — but at 300 Ω is the only load here at which its maker can be held to a figure.
10 headphones reach 100 dB on the Arturia MiniFuse 1 but not on the Focusrite Scarlett Solo 4th gen — HiFiMAN HE-6se V2, HiFiMAN HE6 Remastered, HiFiMAN Susvara, 7 more.
51 headphones are left alone by the Arturia MiniFuse 1 under the one-eighth rule but coloured by the Focusrite Scarlett Solo 4th gen (AKG K612 Pro, Audeze LCD-3, Audeze LCD-4, 48 more).
552 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 Campfire Audio Andromeda 2020: Arturia MiniFuse 1 has +10 dB of headroom there against +3 dB. 7 dB is about 4.5 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Arturia MiniFuse 1 and Focusrite Scarlett Solo 4th gen because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Arturia MiniFuse 1 headroom | Focusrite Scarlett Solo 4th gen headroom | Arturia MiniFuse 1 hiss | Focusrite Scarlett Solo 4th gen hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +30 dB damping | +23 dB damping | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +10 dB damping | +3 dB damping | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +20 dB damping | +14 dB damping | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +17 dB | +15 dB damping | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +11 dB damping | +5 dB damping | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +10 dB | +9 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +6 dB | +5 dB damping | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +2 dB damping | -3 dB damping | not published | not published |
The Arturia MiniFuse 1 costs $10 more than the Focusrite Scarlett Solo 4th gen. Out of the 567 models here, that difference buys 10 more models driven to 100 dB and 51 more models left alone under the one-eighth rule.
Nothing runs the other way: there is no axis here on which the cheaper of the two does better.
Only published figures count here; blank axes are counted separately.
Each in full: Arturia MiniFuse 1 and Focusrite Scarlett Solo 4th gen.