Both are audio interfaces, $210 against $229. 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 SSL 2 MkII reaches 100 dB on 565 of the 567 models here, the Roland Rubix22 on 542.
| Specification | Roland Rubix22 | SSL 2 MkII |
|---|---|---|
| Power into 32Ω | 19 mW | 374 mW |
| Power into 150Ω | 15 mW | 80 mW |
| Power into 300Ω | 9.4 mW | 40 mW |
| Power into 600Ω | 5.4 mW | 20 mW |
| Output impedance | 47 Ω | 1 Ω |
| Output noise | not published | not published |
| Price | $210 | $229 |
| Headphones it reaches 100 dB on out of 567 | 542 | 565 |
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.
23 headphones reach 100 dB on the SSL 2 MkII but not on the Roland Rubix22 — Audeze LCD-5, Dan Clark Audio AEON 2 Closed, Dan Clark Audio AEON 2 Noire, 20 more.
546 headphones are left alone by the SSL 2 MkII under the one-eighth rule but coloured by the Roland Rubix22 (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Ocean, 543 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 Rubix22 and SSL 2 MkII. Or put either against your own headphones in the source comparison tool.