Both are portable players, $800 against $999. 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 SR35 reaches 100 dB on 565 of the 567 models here, the HiBy RS6 on 564.
| Specification | Astell&Kern SR35 | HiBy RS6 |
|---|---|---|
| Power into 32Ω | 300 mW | 180 mW |
| Power into 150Ω | 64 mW | 38 mW |
| Power into 300Ω | 32 mW | 19 mW |
| Power into 600Ω | 16 mW | 9.6 mW |
| Output impedance | 1.1 Ω | 0.4 Ω |
| Output noise | 4 µV unverified | not published |
| Price | $800 | $999 |
| Headphones it reaches 100 dB on out of 567 | 565 | 564 |
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 Astell&Kern SR35 but not on the HiBy RS6 — Symphonium Crimson.
27 headphones are left alone by the HiBy RS6 under the one-eighth rule but coloured by the Astell&Kern SR35 (64 Audio Nio, 64 Audio U18s, 64 Audio Volur, 24 more).
564 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 SR35 and HiBy RS6. Or put either against your own headphones in the source comparison tool.