Both are portable players, $3700 against $3700. 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 Astell&Kern SP3000 reaches 100 dB on 565 of the 567 models here, the Sony NW-WM1ZM2 on 552.
| Specification | Astell&Kern SP3000 | Sony NW-WM1ZM2 |
|---|---|---|
| Power into 32Ω | 340 mW | 30 mW |
| Power into 150Ω | 73 mW | 6.4 mW |
| Power into 300Ω | 36 mW | 3.2 mW |
| Power into 600Ω | 18 mW | 1.6 mW |
| Output impedance | 0.7 Ω | not published |
| Output noise | 3 µV unverified | not published |
| Price | $3700 | $3700 |
| Headphones it reaches 100 dB on out of 567 | 565 | 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.
13 headphones reach 100 dB on the Astell&Kern SP3000 but not on the Sony NW-WM1ZM2 — Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), HiFiMAN HE-6se V2, 10 more.
552 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: Astell&Kern SP3000 and Sony NW-WM1ZM2. Or put either against your own headphones in the source comparison tool.