Short answer
Both are audio interfaces, both at $599.
The SSL 12 reaches 100 dB on 567 of the 567 models here, the Arturia AudioFuse Rev2 on 564.
| Specification | Arturia AudioFuse Rev2 | SSL 12 |
|---|---|---|
| Power into 32Ω | 187 mW | 1.2 W |
| Power into 150Ω | 40 mW | 252 mW |
| Power into 300Ω | 20 mW | 126 mW |
| Power into 600Ω | 10.0 mW | 63 mW |
| Output impedance | 33 Ω | 1 Ω |
| Output noise | not published | not published |
| Price | $599 | $599 |
| Headphones it reaches 100 dB on out of 567 | 564 | 567 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Arturia AudioFuse Rev2 | SSL 12 |
|---|---|---|
| 32 Ω | Upper bound | Upper bound |
| 150 Ω | Upper bound | Upper bound |
| 300 Ω | Upper bound | Upper bound |
| 600 Ω | Upper bound | Upper bound |
Neither maker publishes a power rating at any load. Both columns above are ceilings, worked out from a maximum output voltage on the assumption that the amplifier holds it into the load — the most flattering reading available for either. 24 of the 280 sources here are in that position. Whichever of the two looks the stronger on power, the difference is unproven; the output-impedance and noise rows are the ones to go on.
3 headphones reach 100 dB on the SSL 12 but not on the Arturia AudioFuse Rev2 — Moondrop PARA, Symphonium Crimson, Symphonium Titan.
530 headphones are left alone by the SSL 12 under the one-eighth rule but coloured by the Arturia AudioFuse Rev2 (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Ocean, 527 more).
564 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: SSL 12 has +39 dB of headroom there against +31 dB. 8 dB is about 6.3 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Arturia AudioFuse Rev2 and SSL 12 because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Arturia AudioFuse Rev2 headroom | SSL 12 headroom | Arturia AudioFuse Rev2 hiss | SSL 12 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +31 dB damping | +39 dB | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +11 dB damping | +19 dB | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +20 dB damping | +28 dB | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +16 dB damping | +24 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +13 dB damping | +21 dB | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +9 dB | +17 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +5 dB | +13 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +3 dB damping | +11 dB | not published | not published |
These two cost the same, $599, so price settles nothing. Out of the 567 models here, the SSL 12 drives 3 models to 100 dB and leaves 530 alone under the one-eighth rule — and on the other side there is no such advantage at all.
Only published figures count here; blank axes are counted separately.
Each in full: Arturia AudioFuse Rev2 and SSL 12.