Short answer
Both are audio interfaces, $194 against $199.
The Steinberg UR24C reaches 100 dB on 558 of the 567 models here, the Tascam US-2x2HR on 541.
| Specification | Steinberg UR24C | Tascam US-2x2HR |
|---|---|---|
| Power into 32Ω | 80 mW | 18 mW |
| Power into 150Ω | 27 mW | 17 mW |
| Power into 300Ω | 13 mW | 12 mW |
| Power into 600Ω | 6.7 mW | 7.3 mW |
| Output impedance | not published | 66 Ω |
| Output noise | not published | not published |
| Price | $194 | $199 |
| Headphones it reaches 100 dB on out of 567 | 558 | 541 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Steinberg UR24C | Tascam US-2x2HR |
|---|---|---|
| 32 Ω | Derived | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Derived | Derived |
Only one of these two columns starts from a power rating. Tascam US-2x2HR publishes one at 32 Ω; Steinberg UR24C 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 UR24C understates rather than flatters — but at 32 Ω is the only load here at which its maker can be held to a figure.
17 headphones reach 100 dB on the Steinberg UR24C but not on the Tascam US-2x2HR — Abyss AB-1266 Phi TC, Audeze LCD-5, Dan Clark Audio AEON 2 Closed, 14 more.
541 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: Steinberg UR24C has +28 dB of headroom there against +21 dB. 6 dB is about 4.4 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Steinberg UR24C and Tascam US-2x2HR because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Steinberg UR24C headroom | Tascam US-2x2HR headroom | Steinberg UR24C hiss | Tascam US-2x2HR hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +28 dB | +21 dB damping | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +8 dB | +1 dB damping | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +19 dB | +13 dB damping | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +14 dB | +13 dB damping | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +9 dB | +2 dB damping | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +7 dB | +7 dB damping | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +3 dB | +3 dB damping | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +1 dB | -5 dB damping | not published | not published |
The Tascam US-2x2HR costs $5 more than the Steinberg UR24C, and on these three axes the money buys nothing: among the 567 models here there is not one that the Tascam US-2x2HR handles and the Steinberg UR24C does not — not on power, not on the one-eighth rule, not on hiss. The traffic runs the other way: the cheaper Steinberg UR24C drives 17 models to 100 dB that the Tascam US-2x2HR does not.
Only published figures count here; blank axes are counted separately.
Each in full: Steinberg UR24C and Tascam US-2x2HR.