Both are audio interfaces, $210 against $200. 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 Zoom AMS-44 reaches 100 dB on 549 of the 567 models here, the Roland Rubix22 on 542.
| Specification | Roland Rubix22 | Zoom AMS-44 |
|---|---|---|
| Power into 32Ω | 19 mW | 30 mW |
| Power into 150Ω | 15 mW | 9.7 mW |
| Power into 300Ω | 9.4 mW | 5.2 mW |
| Power into 600Ω | 5.4 mW | 2.7 mW |
| Output impedance | 47 Ω | 10 Ω |
| Output noise | not published | not published |
| Price | $210 | $200 |
| Headphones it reaches 100 dB on out of 567 | 542 | 549 |
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.
1 headphone reaches 100 dB on the Roland Rubix22 but not on the Zoom AMS-44 — Sennheiser HD 600.
8 headphones reach 100 dB on the Zoom AMS-44 but not on the Roland Rubix22 — Audeze LCD-5, Dan Clark Audio AEON 2 Closed, Dan Clark Audio AEON 2 Noire, 5 more.
51 headphones are left alone by the Zoom AMS-44 under the one-eighth rule but coloured by the Roland Rubix22 (AKG K612 Pro, Audeze LCD-3, Audeze LCD-4, 48 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: Roland Rubix22 and Zoom AMS-44. Or put either against your own headphones in the source comparison tool.