Short answer
Both are audio interfaces, $349 against $340.
The Audient iD14 MkII reaches 100 dB on 561 of the 567 models here, the Roland BRIDGE CAST on 558.
| Specification | Audient iD14 MkII | Roland BRIDGE CAST |
|---|---|---|
| Power into 32Ω | 112 mW | 78 mW |
| Power into 150Ω | 75 mW | 36 mW |
| Power into 300Ω | 55 mW | 29 mW |
| Power into 600Ω | 50 mW | 15 mW |
| Output impedance | not published | 10 Ω |
| Output noise | not published | not published |
| Price | $349 | $340 |
| Headphones it reaches 100 dB on out of 567 | 561 | 558 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Audient iD14 MkII | Roland BRIDGE CAST |
|---|---|---|
| 32 Ω | Derived | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Recomputed | Derived |
Only one of these two columns starts from a power rating. Roland BRIDGE CAST publishes one at 32 Ω; Audient iD14 MkII publishes none at any of these four loads, so its column is worked out from power it published at other loads. Both are arithmetic on a maker’s own figures rather than guesses, and the method used for the Audient iD14 MkII understates rather than flatters — but at 32 Ω is the only load here at which its maker can be held to a figure.
3 headphones reach 100 dB on the Audient iD14 MkII but not on the Roland BRIDGE CAST — Moondrop PARA 2, Moondrop VENUS, Symphonium Triton.
558 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 Audeze LCD-2 Classic: Audient iD14 MkII has +22 dB of headroom there against +18 dB. 4 dB is about 2.7 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Audient iD14 MkII and Roland BRIDGE CAST because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Audient iD14 MkII headroom | Roland BRIDGE CAST headroom | Audient iD14 MkII hiss | Roland BRIDGE CAST hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +29 dB | +27 dB damping | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +9 dB | +7 dB damping | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +22 dB | +18 dB damping | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +20 dB | +17 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +11 dB | +9 dB damping | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +15 dB | +11 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +9 dB | +6 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +4 dB | +0 dB damping | not published | not published |
The Audient iD14 MkII costs $9 more than the Roland BRIDGE CAST. Out of the 567 models here, that difference buys 3 more models driven to 100 dB.
Nothing runs the other way: there is no axis here on which the cheaper of the two does better.
Only published figures count here; blank axes are counted separately.
Each in full: Audient iD14 MkII and Roland BRIDGE CAST.