Both are Bluetooth receivers, $36 against $50. 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 Fosi Audio N3 reaches 100 dB on 562 of the 567 models here, the FiiO BTR11 on 549.
| Specification | FiiO BTR11 | Fosi Audio N3 |
|---|---|---|
| Power into 32Ω | 30 mW | 138 mW |
| Power into 150Ω | 6.2 mW | 30 mW |
| Power into 300Ω | 3.0 mW | 15 mW |
| Power into 600Ω | 1.5 mW | 7.5 mW |
| Output impedance | 0.5 Ω | not published |
| Output noise | 8.0 µV | not published |
| Price | $36 | $50 |
| Headphones it reaches 100 dB on out of 567 | 549 | 562 |
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 Fosi Audio N3 but not on the FiiO BTR11 — Audio-Technica ATH-R70xa, Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), 10 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: FiiO BTR11 and Fosi Audio N3. Or put either against your own headphones in the source comparison tool.