Both are portable players, $350 against $1399. 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 Sony NW-WM1AM2 reaches 100 dB on 552 of the 567 models here, the Sony NW-A306 on 530.
| Specification | Sony NW-A306 | Sony NW-WM1AM2 |
|---|---|---|
| Power into 32Ω | 18 mW | 30 mW |
| Power into 150Ω | 3.7 mW | 6.4 mW |
| Power into 300Ω | 1.9 mW | 3.2 mW |
| Power into 600Ω | 0.90 mW | 1.6 mW |
| Output impedance | 1.5 Ω unverified | 1 Ω unverified |
| Output noise | 5 µV unverified | 3 µV unverified |
| Price | $350 | $1399 |
| Headphones it reaches 100 dB on out of 567 | 530 | 552 |
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.
22 headphones reach 100 dB on the Sony NW-WM1AM2 but not on the Sony NW-A306 — AKG K612 Pro, Abyss AB-1266 Phi CC, Abyss AB-1266 Phi TC, 19 more.
530 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: Sony NW-A306 and Sony NW-WM1AM2. Or put either against your own headphones in the source comparison tool.