Apogee Duet 3 vs Arturia AudioFuse Rev2

Short answer

More power: the Apogee Duet 3, with 1.18 W into 32 Ω; the Arturia AudioFuse Rev2 has 187 mW. The Apogee Duet 3 drives 3 headphones to 100 dB that the Arturia AudioFuse Rev2 cannot (Moondrop PARA, Symphonium Crimson, Symphonium Titan).
Hiss with sensitive IEMs: cannot be compared — neither maker publishes a noise figure.
Output impedance: 544 headphones are left alone by the Apogee Duet 3 under the one-eighth rule but coloured by the Arturia AudioFuse Rev2 (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Nio, 541 more).
Price: the Apogee Duet 3 costs $50 more; what that buys on these numbers is set out further down, under What the price difference buys.

Both are audio interfaces, $649 against $599.

The Apogee Duet 3 reaches 100 dB on 567 of the 567 models here, the Arturia AudioFuse Rev2 on 564.

Every published figure, next to each other

Specification	Apogee Duet 3	Arturia AudioFuse Rev2
Power into 32Ω	1.2 W	187 mW
Power into 150Ω	252 mW	40 mW
Power into 300Ω	126 mW	20 mW
Power into 600Ω	63 mW	10.0 mW
Output impedance	0.5 Ω	33 Ω
Output noise	not published	not published
Price	$649	$599
Headphones it reaches 100 dB on out of 567	567	564

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

Where each power figure comes from

Load	Apogee Duet 3	Arturia AudioFuse Rev2
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.

What the labels mean.

The headphones that tell them apart

3 headphones reach 100 dB on the Apogee Duet 3 but not on the Arturia AudioFuse Rev2 — Moondrop PARA, Symphonium Crimson, Symphonium Titan.

544 headphones are left alone by the Apogee Duet 3 under the one-eighth rule but coloured by the Arturia AudioFuse Rev2 (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Nio, 541 more).

564 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 Shure SE846: Apogee Duet 3 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 Apogee Duet 3 and Arturia AudioFuse Rev2 because neither maker publishes no output noise figure.

Headphone	Impedance	Needs	Apogee Duet 3 headroom	Arturia AudioFuse Rev2 headroom	Apogee Duet 3 hiss	Arturia AudioFuse Rev2 hiss
Shure SE846	9 Ω	0.04 mW	+39 dB	+31 dB damping	not published	not published
Campfire Audio Andromeda 2020	9 Ω	4.0 mW	+19 dB	+11 dB damping	not published	not published
Audeze LCD-2 Classic	70 Ω	0.79 mW	+28 dB	+20 dB damping	not published	not published
Beyerdynamic DT 1990 Pro (250Ω)	250 Ω	0.63 mW	+24 dB	+16 dB damping	not published	not published
HiFiMAN HE400se	25 Ω	7.9 mW	+21 dB	+13 dB damping	not published	not published
Audio-Technica ATH-R70X	470 Ω	1.6 mW	+17 dB	+9 dB	not published	not published
Sennheiser HD 600	300 Ω	6.6 mW	+13 dB	+5 dB	not published	not published
HiFiMAN Susvara	60 Ω	50 mW	+11 dB	+3 dB damping	not published	not published

The gap in dollars, against the gap in numbers

The Apogee Duet 3 costs $50 more than the Arturia AudioFuse Rev2. Out of the 567 models here, that difference buys 3 more models driven to 100 dB and 544 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.