Both are desktop DAC/amps, $176 against $199. 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 FiiO K11 R2R reaches 100 dB on 567 of the 567 models here, the Fosi Audio K7 on 566.
| Specification | FiiO K11 R2R | Fosi Audio K7 |
|---|---|---|
| Power into 32Ω | 460 mW | 600 mW |
| Power into 150Ω | 99 mW | 128 mW |
| Power into 300Ω | 50 mW | 64 mW |
| Power into 600Ω | 25 mW | 32 mW |
| Output impedance | 1.0 Ω | not published |
| Output noise | 7.2 µV | 2.5 µV |
| Price | $176 | $199 |
| Headphones it reaches 100 dB on out of 567 | 567 | 566 |
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 FiiO K11 R2R but not on the Fosi Audio K7 — Symphonium Titan.
121 headphones stay below the audible-hiss threshold on the Fosi Audio K7 but cross it on the FiiO K11 R2R (64 Audio Aspire 1, 64 Audio Nio, 64 Audio Ocean, 118 more).
566 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 K11 R2R and Fosi Audio K7. Or put either against your own headphones in the source comparison tool.