Short answer
Both are audio interfaces, both at $3500.
On raw power they are level: each reaches 100 dB on 566 of the 567 non-electrostatic models here.
| Specification | Audient Horizon 8P | Audient ORIA |
|---|---|---|
| Power into 32Ω | 986 mW | 979 mW |
| Power into 150Ω | 278 mW | 385 mW |
| Power into 300Ω | 140 mW | 210 mW |
| Power into 600Ω | 71 mW | 123 mW |
| Output impedance | 10 Ω | 50 Ω |
| Output noise | not published | not published |
| Price | $3500 | $3500 |
| Headphones it reaches 100 dB on out of 567 | 566 | 566 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Audient Horizon 8P | Audient ORIA |
|---|---|---|
| 32 Ω | Derived | Derived |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Published | Published |
Both makers publish a power rating. Audient Horizon 8P publishes at 600 Ω; Audient ORIA at 600 Ω. The other rows are worked out from those.
The two publish at the same loads, which is the one case where the rows of this table can be read straight across.
On power they are interchangeable across this whole database: there is no headphone here that one reaches 100 dB on and the other does not.
51 headphones are left alone by the Audient Horizon 8P under the one-eighth rule but coloured by the Audient ORIA (AKG K612 Pro, Audeze LCD-3, Audeze LCD-4, 48 more).
566 of the 567 models here reach 100 dB on both.
Headroom is at a 100 dB SPL peak.
The widest gap on the list is the Audio-Technica ATH-R70X: Audient ORIA has +20 dB of headroom there against +18 dB. 2 dB is about 1.6 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Audient Horizon 8P and Audient ORIA because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Audient Horizon 8P headroom | Audient ORIA headroom | Audient Horizon 8P hiss | Audient ORIA hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +39 dB damping | +39 dB damping | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +19 dB damping | +19 dB damping | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +29 dB damping | +30 dB damping | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +24 dB | +26 dB damping | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +20 dB damping | +20 dB damping | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +18 dB | +20 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +13 dB | +15 dB damping | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +11 dB damping | +13 dB damping | not published | not published |
These two cost the same, $3500, so price settles nothing. Out of the 567 models here, the Audient Horizon 8P leaves 51 models alone under the one-eighth rule — and on the other side there is no such advantage at all.
Only published figures count here; blank axes are counted separately.
Each in full: Audient Horizon 8P and Audient ORIA.