Both are dongles, $70 against $79. 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 EPZ TP35 Pro reaches 100 dB on 561 of the 567 models here, the FiiO KA13 on 555.
| Specification | EPZ TP35 Pro | FiiO KA13 |
|---|---|---|
| Power into 32Ω | 112 mW | 50 mW |
| Power into 150Ω | 24 mW | 10 mW |
| Power into 300Ω | 12 mW | 5.0 mW |
| Power into 600Ω | 6.0 mW | 2.5 mW |
| Output impedance | not published | 1.7 Ω |
| Output noise | not published | 2.5 µV |
| Price | $70 | $79 |
| Headphones it reaches 100 dB on out of 567 | 561 | 555 |
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.
7 headphones reach 100 dB on the EPZ TP35 Pro but not on the FiiO KA13 — Beyerdynamic DT 880 Edition (600Ω), Beyerdynamic DT 990 Edition (600Ω), HiFiMAN HE-6se V2, 4 more.
1 headphone reaches 100 dB on the FiiO KA13 but not on the EPZ TP35 Pro — Symphonium Zenith.
554 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: EPZ TP35 Pro and FiiO KA13. Or put either against your own headphones in the source comparison tool.