| In | |||
| Count | Format | Connector | Details |
| 8 | Mic/line analogue | Combi XLR | Including 2 instrument inputs |
| 2 | S/PDIF | RCA Phono | Can be routed via lightpipe |
| 8 | ADAT | Optical Lightpipe | 4 channels via SMUX 2 96kHz |
| 16 | MIDI | 5pin DIN connector | Provides 16 channels of MIDI |
| Out | |||
| 2 | Line analogue | ¼” TRS Jack | Dedicated monitor outputs |
| 8 | Line analogue | ¼” TRS Jack | 4 outputs (7/8 & 9/10) are also available via the 2 independently controlled, stereo headphone ¼” Jack on the front panel |
| 2 | S/PDIF | RCA Phono | Can be routed via Lightpipe |
| 8 | ADAT | Optical Lightpipe | 4 channels via SMUX @ 96 kHz |
| 16 | MIDI | 5pin DIN connector | Provides 16 channels of MIDI |

Scarlett 18i20
USB 2.0 audio interface with eight Focusrite mic preamps
