Both are audio interfaces, $400 against $340. 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 IK Multimedia AXE I/O reaches 100 dB on 561 of the 567 models here, the Roland BRIDGE CAST on 558.
| Specification | IK Multimedia AXE I/O | Roland BRIDGE CAST |
|---|---|---|
| Power into 32Ω | 115 mW | 78 mW |
| Power into 150Ω | 60 mW | 36 mW |
| Power into 300Ω | 30 mW | 29 mW |
| Power into 600Ω | 15 mW | 15 mW |
| Output impedance | <0.1 Ω | 10 Ω |
| Output noise | not published | not published |
| Price | $400 | $340 |
| Headphones it reaches 100 dB on out of 567 | 561 | 558 |
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.
3 headphones reach 100 dB on the IK Multimedia AXE I/O but not on the Roland BRIDGE CAST — Moondrop PARA 2, Moondrop VENUS, Symphonium Triton.
510 headphones are left alone by the IK Multimedia AXE I/O under the one-eighth rule but coloured by the Roland BRIDGE CAST (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Nio, 507 more).
558 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: IK Multimedia AXE I/O and Roland BRIDGE CAST. Or put either against your own headphones in the source comparison tool.