Both are audio interfaces, $199 against $199. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?
The Universal Audio Volt 2 reaches 100 dB on 558 of the 567 models here, the Tascam US-2x2HR on 541.
| Specification | Tascam US-2x2HR | Universal Audio Volt 2 |
|---|---|---|
| Power into 32Ω | 18 mW | 84 mW |
| Power into 150Ω | 17 mW | 28 mW |
| Power into 300Ω | 12 mW | 22 mW |
| Power into 600Ω | 7.3 mW | 12 mW |
| Output impedance | 66 Ω | not published |
| Output noise | not published | not published |
| Price | $199 | $199 |
| Headphones it reaches 100 dB on out of 567 | 541 | 558 |
A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.
17 headphones reach 100 dB on the Universal Audio Volt 2 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. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.
Each has a page of its own with every power figure traced to what the maker published and a full headphone list: Tascam US-2x2HR and Universal Audio Volt 2. Or put either against your own headphones in the source comparison tool.