Both are audio interfaces, $432 against $589. 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 476P reaches 100 dB on 558 of the 567 models here, the Roland Rubix44 on 542.
| Specification | Roland Rubix44 | Universal Audio Volt 476P |
|---|---|---|
| Power into 32Ω | 19 mW | 84 mW |
| Power into 150Ω | 15 mW | 28 mW |
| Power into 300Ω | 9.4 mW | 22 mW |
| Power into 600Ω | 5.4 mW | 12 mW |
| Output impedance | 47 Ω | not published |
| Output noise | not published | not published |
| Price | $432 | $589 |
| Headphones it reaches 100 dB on out of 567 | 542 | 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.
16 headphones reach 100 dB on the Universal Audio Volt 476P but not on the Roland Rubix44 — Audeze LCD-5, Dan Clark Audio AEON 2 Closed, Dan Clark Audio AEON 2 Noire, 13 more.
542 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: Roland Rubix44 and Universal Audio Volt 476P. Or put either against your own headphones in the source comparison tool.