Arturia AudioFuse Rev2 vs Audient iD24

Short answer

More power: the Arturia AudioFuse Rev2, with 187 mW into 32 Ω; the Audient iD24 has 119 mW. The Arturia AudioFuse Rev2 drives 3 headphones to 100 dB that the Audient iD24 cannot (Moondrop COSMO, Symphonium Helios, Symphonium Zenith).
Hiss with sensitive IEMs: cannot be compared — neither maker publishes a noise figure.
Output impedance: 16 headphones are left alone by the Arturia AudioFuse Rev2 under the one-eighth rule but coloured by the Audient iD24 (FiiO FT3 (350Ω), Sennheiser HD 600, Sennheiser HD 650, 13 more).
Price: the same, $599.

Both are audio interfaces, both at $599.

The Arturia AudioFuse Rev2 reaches 100 dB on 564 of the 567 models here, the Audient iD24 on 561.

Every published figure, next to each other

Specification	Arturia AudioFuse Rev2	Audient iD24
Power into 32Ω	187 mW	119 mW
Power into 150Ω	40 mW	80 mW
Power into 300Ω	20 mW	58 mW
Power into 600Ω	10.0 mW	52 mW
Output impedance	33 Ω	50 Ω
Output noise	not published	not published
Price	$599	$599
Headphones it reaches 100 dB on out of 567	564	561

Not published means the maker leaves it out, so that axis cannot be compared.

Where each power figure comes from

Load	Arturia AudioFuse Rev2	Audient iD24
32 Ω	Upper bound	Derived
150 Ω	Upper bound	Derived
300 Ω	Upper bound	Derived
600 Ω	Upper bound	Recomputed

Neither column is a power rating, and the two are not even weak in the same way. The Arturia AudioFuse Rev2 figures are ceilings worked out from a maximum output voltage, on the assumption that the amplifier holds it into the load. The Audient iD24 figures are worked out from figures its maker did publish — power at other loads, or the voltage printed beside it. The second method understates; the first flatters. That is the wrong way round for reading the table straight across, so a gap in favour of the Arturia AudioFuse Rev2 is the one to doubt.

What the labels mean.

The headphones that tell them apart

3 headphones reach 100 dB on the Arturia AudioFuse Rev2 but not on the Audient iD24 — Moondrop COSMO, Symphonium Helios, Symphonium Zenith.

16 headphones are left alone by the Arturia AudioFuse Rev2 under the one-eighth rule but coloured by the Audient iD24 (FiiO FT3 (350Ω), Sennheiser HD 600, Sennheiser HD 650, 13 more).

561 of the 567 models here reach 100 dB on both.

Headroom and hiss on 8 models, both sources

Headroom is at a 100 dB SPL peak.

The widest gap on the list is the Audio-Technica ATH-R70X: Audient iD24 has +15 dB of headroom there against +9 dB. 6 dB is about 4.1 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 Audient iD24 because neither maker publishes no output noise figure.

Headphone	Impedance	Needs	Arturia AudioFuse Rev2 headroom	Audient iD24 headroom	Arturia AudioFuse Rev2 hiss	Audient iD24 hiss
Shure SE846	9 Ω	0.04 mW	+31 dB damping	+29 dB damping	not published	not published
Campfire Audio Andromeda 2020	9 Ω	4.0 mW	+11 dB damping	+9 dB damping	not published	not published
Audeze LCD-2 Classic	70 Ω	0.79 mW	+20 dB damping	+22 dB damping	not published	not published
Beyerdynamic DT 1990 Pro (250Ω)	250 Ω	0.63 mW	+16 dB damping	+20 dB damping	not published	not published
HiFiMAN HE400se	25 Ω	7.9 mW	+13 dB damping	+11 dB damping	not published	not published
Audio-Technica ATH-R70X	470 Ω	1.6 mW	+9 dB	+15 dB	not published	not published
Sennheiser HD 600	300 Ω	6.6 mW	+5 dB	+9 dB damping	not published	not published
HiFiMAN Susvara	60 Ω	50 mW	+3 dB damping	+5 dB damping	not published	not published

The gap in dollars, against the gap in numbers

These two cost the same, $599, so price settles nothing. Out of the 567 models here, the Arturia AudioFuse Rev2 drives 3 models to 100 dB and leaves 16 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.