Both are audio interfaces, $150 against $399. 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 UAC-232 reaches 100 dB on 563 of the 567 models here, the Zoom AMS-24 on 549.
| Specification | Zoom AMS-24 | Zoom UAC-232 |
|---|---|---|
| Power into 32Ω | 30 mW | 148 mW |
| Power into 150Ω | 9.7 mW | 51 mW |
| Power into 300Ω | 5.2 mW | 28 mW |
| Power into 600Ω | 2.7 mW | 14 mW |
| Output impedance | 10 Ω | 12 Ω |
| Output noise | not published | not published |
| Price | $150 | $399 |
| Headphones it reaches 100 dB on out of 567 | 549 | 563 |
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.
14 headphones reach 100 dB on the Zoom UAC-232 but not on the Zoom AMS-24 — HiFiMAN HE-6se V2, HiFiMAN HE6 Remastered, HiFiMAN Susvara, 11 more.
10 headphones are left alone by the Zoom AMS-24 under the one-eighth rule but coloured by the Zoom UAC-232 (Beyerdynamic Custom Studio, Beyerdynamic DT 1350, Beyerdynamic DT 770 PRO Black Edition (80Ω), 7 more).
549 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: Zoom AMS-24 and Zoom UAC-232. Or put either against your own headphones in the source comparison tool.