Between the FH19 and Monarch MKIII, the FH19 comes out ahead in impedance, while the Monarch MKIII wins on several specs. Overall, the FH19 scores 72.9 and the Monarch MKIII scores 72.9 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes, with the decision sitting on which individual spec advantages weigh more for your use.
Pick the FH19 if you care most about impedance. The biggest gaps in its favor are impedance.
The Monarch MKIII similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable driver count, sensitivity, detachable cable, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why FiiO - FH19 wins
- ▲Impedance — 10.00 Ω less. 12 vs 22.
Why ThieAudio - Monarch MKIII wins
- No decisive advantages.
Spec comparison
Drivers
| Spec | FiiO - FH19 | ThieAudio - Monarch MKIII |
|---|---|---|
| Driver count | 10 | 10 |
| Driver types | 1DD + 8BA + 1BC Hybrid | 1DD + 6BA + 2EST + 1 Bone Conduction Tribrid |
| Impedanceⓘ | 12 Ωlead | 22 Ω |
| Sensitivityⓘ | 112 dB | 112 dB |
Build
| Spec | FiiO - FH19 | ThieAudio - Monarch MKIII |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | 2-pinlead |
Frequently asked
Spec-level deep dives
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