Both are Bluetooth receivers, $109 against $109. 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 BTR5 2021 reaches 100 dB on 563 of the 567 models here, the HiBy W5 on 557.
| Specification | FiiO BTR5 2021 | HiBy W5 |
|---|---|---|
| Power into 32Ω | 80 mW | 80 mW |
| Power into 150Ω | 17 mW | 17 mW |
| Power into 300Ω | 8.5 mW | 8.5 mW |
| Power into 600Ω | 4.3 mW | 4.3 mW |
| Output impedance | 1.0 Ω | not published |
| Output noise | 2.0 µV | not published |
| Price | $109 | $109 |
| Headphones it reaches 100 dB on out of 567 | 563 | 557 |
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.
6 headphones reach 100 dB on the FiiO BTR5 2021 but not on the HiBy W5 — Moondrop COSMO, Moondrop PARA 2, Moondrop VENUS, 3 more.
557 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 BTR5 2021 and HiBy W5. Or put either against your own headphones in the source comparison tool.