Independent testing
How much independent testing exists for each audio interface
Of the 11 audio interfaces we track, 1 have been physically measured by at least one independent lab. Below is every one, ordered by how much independent hands-on evidence stands behind it — densest first.
A coverage record, not a ranking of which is best.
| Product | Independent labs | Metrics measured | Outlets on record |
|---|---|---|---|
| Volt 276 USB Audio Interface | 1 | 1 | 1 |
| Apollo Twin X DUO Gen 2 (Thunderbolt) | 0 | 0 | 1 |
| EVO 4 | 0 | 0 | 2 |
| Scarlett 2i2 4th Generation | 0 | 0 | 1 |
| Scarlett 4i4 4th Generation | 0 | 0 | 1 |
| Scarlett Solo 4th Generation | 0 | 0 | 1 |
| SSL 2+ MKII | 0 | 0 | 2 |
| Studio 24c | 0 | 0 | 1 |
| U-Phoria UMC22 | 0 | 0 | 1 |
| UR22C | 0 | 0 | 1 |
| Volt 2 USB Audio Interface | 0 | 0 | 1 |
Each figure is a count of what independent testers actually did — how we count. A low count means little independent evidence has been gathered yet, never that a product is worse. See also the Audio Interfaces buying guide and the reviewers we cite.