Audient
iD4 MkII
$199Cheaper
Released 2021-02
Best Audio Interfaces · head-to-head
iD4 MkII vs SSL 2+ MKII
A sourced, side-by-side comparison. iD4 MkII is cheaper at $199. Every spec and price links to its source.
Solid State Logic
SSL 2+ MKII
$299.99
Released 2024-10
Which is better: the iD4 MkII or SSL 2+ MKII?
On the specs we track, they're closely matched. The iD4 MkII is the cheaper at $199.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | iD4 MkII | SSL 2+ MKII |
|---|---|---|
| US price | $199 | $299.99 |
| Brand | Audient | Solid State Logic |
| Released | 2021-02 | 2024-10 |
| Inputs analog | 2 | 2 |
| Outputs analog | 2 | 4 |
| Max resolution bit (kHz) | 24-bit / 96 kHz | 32-bit / 192 kHz |
| Mic preamps | 1 | 2 |
| Connection | usb_c | usb_c |
| Midi io | No | Yes |
| Bus powered | Yes | Yes |
| Release year | 2021 | 2024 |
Sources — iD4 MkII: audient.com (verified 2026-06-19). SSL 2+ MKII: solidstatelogic.com (verified 2026-06-19).
What's the difference between the iD4 MkII and SSL 2+ MKII?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Outputs analog: iD4 MkII 2 vs SSL 2+ MKII 4
- Max resolution bit (kHz): iD4 MkII 24-bit / 96 kHz vs SSL 2+ MKII 32-bit / 192 kHz
- Mic preamps: iD4 MkII 1 vs SSL 2+ MKII 2
- Midi io: iD4 MkII false vs SSL 2+ MKII true
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
iD4 MkII
No sourced tester review yet.
SSL 2+ MKII
Two whitelisted hands-on reviews (Sound on Sound, MusicRadar) both recommend the SSL 2+ MKII, praising its intuitive physical-controls workflow (no companion app needed) and clean, crisp preamps. Neither published its own lab measurements, so the dynamic-range gains they mention are SSL's own specs, not independently verified. MusicRadar's main gripe is the plasticky, lightweight feel versus all-metal rivals. (2 sourced reviews.)
Praised: Intuitive physical-controls workflow, everything in reach with no control-panel/companion app required; Clean, crisp, high-quality preamps — among the cleanest around; Worthwhile MkII refresh: front instrument jacks, status LEDs, extra balanced outputs.
Flagged: Plasticky, lightweight chassis and buttons lacking tactile click versus all-metal rivals; Probably overkill for a solo musician; 32-bit/192kHz spec offers little practical recording benefit over 24-bit.