Short answer
Both are audio interfaces, $199 against $299.
The Universal Audio Volt 276 reaches 100 dB on 558 of the 567 models here, the Steinberg UR22C on 512.
| Specification | Steinberg UR22C | Universal Audio Volt 276 |
|---|---|---|
| Power into 32Ω | 12 mW | 84 mW |
| Power into 150Ω | 4.0 mW | 28 mW |
| Power into 300Ω | 2.0 mW | 22 mW |
| Power into 600Ω | 1.0 mW | 12 mW |
| Output impedance | not published | not published |
| Output noise | not published | not published |
| Price | $199 | $299 |
| Headphones it reaches 100 dB on out of 567 | 512 | 558 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Steinberg UR22C | Universal Audio Volt 276 |
|---|---|---|
| 32 Ω | Derived | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Published |
| 600 Ω | Derived | Published |
Only one of these two columns starts from a power rating. Universal Audio Volt 276 publishes one at 32 Ω, at 300 Ω and at 600 Ω; Steinberg UR22C 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 Steinberg UR22C understates rather than flatters — but at 32 Ω, at 300 Ω and at 600 Ω are the only loads here at which its maker can be held to a figure.
46 headphones reach 100 dB on the Universal Audio Volt 276 but not on the Steinberg UR22C — AKG K612 Pro, Abyss AB-1266 Phi CC, Abyss AB-1266 Phi TC, 43 more.
512 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 Audio-Technica ATH-R70X: Universal Audio Volt 276 has +10 dB of headroom there against -1 dB. 11 dB is about 12 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Steinberg UR22C and Universal Audio Volt 276 because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Steinberg UR22C headroom | Universal Audio Volt 276 headroom | Steinberg UR22C hiss | Universal Audio Volt 276 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +19 dB | +28 dB | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | -1 dB | +8 dB | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +10 dB | +18 dB | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +6 dB | +16 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +1 dB | +9 dB | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | -1 dB | +10 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | -5 dB | +5 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | -7 dB | +0 dB | not published | not published |
The Universal Audio Volt 276 costs $100 more than the Steinberg UR22C. Out of the 567 models here, that difference buys 46 more models driven to 100 dB.
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: Steinberg UR22C and Universal Audio Volt 276.