Both are audio interfaces, $3500 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 Audient Horizon 8P reaches 100 dB on 566 of the 567 models here, the Audient iD4 MkII on 561.
| Specification | Audient Horizon 8P | Audient iD4 MkII |
|---|---|---|
| Power into 32Ω | 986 mW | 112 mW |
| Power into 150Ω | 278 mW | 75 mW |
| Power into 300Ω | 140 mW | 55 mW |
| Power into 600Ω | 71 mW | 50 mW |
| Output impedance | 10 Ω | not published |
| Output noise | not published | not published |
| Price | $3500 | $199 |
| Headphones it reaches 100 dB on out of 567 | 566 | 561 |
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.
5 headphones reach 100 dB on the Audient Horizon 8P but not on the Audient iD4 MkII — Moondrop COSMO, Moondrop PARA, Symphonium Crimson, 2 more.
561 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: Audient Horizon 8P and Audient iD4 MkII. Or put either against your own headphones in the source comparison tool.