Focusrite's flagship 4th-gen 1U rack interface offers 18 inputs and 20 outputs over a single USB-C connection (USB 2.0 protocol). Eight XLR/TRS combo inputs with Auto Gain and Air mode pair with ten balanced line outputs, two independent headphone outputs, dual ADAT optical I/O, coaxial S/PDIF I/O, 5-pin DIN MIDI, and a BNC Word Clock output. A built-in talkback mic routes to the headphones by default. Mains-powered via a 3-prong IEC C14 inlet.
Focusrite’s flagship 18-in/20-out rack USB-C interface: 8 preamps, 10 line outs, 2 headphones, ADAT, S/PDIF, MIDI, IEC C14 power.
Device Information
- Manufacturer
- Focusrite
- Release Year
- 2023
- Model Number
- Scarlett 18i20 4th Gen
- Category
- Audio Interface
Available Ports
| Connector | Quantity | Label | Notes |
|---|---|---|---|
| XLR (3-pin Balanced Audio) | 8 | Inputs 1–8 — XLR (combo) | Mic preamps with 48V phantom (switchable per pair); XLR portion of XLR/TRS combo jacks. Inputs 1–2 are on the front panel, 3–8 on the rear. |
| 6.35mm TRS (1/4 inch Audio) | 8 | Inputs 1–8 — 1/4" (combo) | Hi-Z / line portion of combo inputs. |
| 6.35mm TRS (1/4 inch Audio) | 10 | Line Outputs 1–10 (rear, balanced) | Ten balanced line outputs. Outputs 1–2 and 3–4 can drive two pairs of monitors with Alt-speaker A/B switching. |
| 6.35mm TRS (1/4 inch Audio) | 2 | Headphones 1 & 2 (front) | Two independent stereo 1/4" TRS headphone outputs with dedicated mixes; talkback routes here by default. |
| Optical TOSLINK (S/PDIF) | 4 | ADAT 1 In/Out, ADAT 2 In/Out (rear) | Dual ADAT optical I/O (TOSLINK connector). 8ch @ 48kHz per pair, SMUX for 96/192 kHz operation. |
| Coaxial S/PDIF (RCA Digital) | 2 | S/PDIF In / Out (rear) | Stereo coaxial S/PDIF input and output (75Ω RCA). |
| 5-pin DIN MIDI | 2 | MIDI In / MIDI Out (rear) | Standard 5-pin DIN MIDI 1.0 input and output sockets. |
| USB Type-C (USB 2.0) | 1 | USB-C (rear, to host) | USB-C connector with USB 2.0 protocol. |
| IEC C14 (3-Pin Power Inlet) | 1 | AC Mains Inlet (rear) | 3-prong IEC C14 inlet for a standard C13 kettle cord. |
Notes & Compatibility
USB-C connector runs USB 2.0 protocol despite rack form factor. ADAT I/O uses TOSLINK physical connector (8ch @ 48kHz per port, SMUX for higher rates). Includes BNC Word Clock OUT — BNC not currently in Cablebabe connector database; flag for manual review.
