Rear panel – Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) User Manual
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13. LINE INPUTS 5 to 8 – the inputs are balanced, on ¼” (6.35 mm) jack sockets. Connect further
line level sources here, using either ¼” TRS (balanced) or TS (unbalanced) jack plugs.
14. LINE OUTPUTS 1 to 4 – four balanced analogue line outputs on ¼” (6.35 mm) jack sockets;
use TRS jacks for a balanced connection or TS jacks for unbalanced. Outputs 1 and 2 will
normally be used to drive the primary monitoring system, though the signals available at any
of these outputs may be defined in Focusrite Control. Outputs 3 and 4 can typically be used for
driving alternative speakers (i.e., midfield, nearfield, etc.), or to drive outboard FX processors.
15. OPTICAL INPUT – TOSLINK connector able to carry eight channels of digital audio in ADAT
format at 44.1/48 kHz sample rate or four channels at 88.2/96 kHz. These are simply additional
inputs (13 to 20) to the Scarlett 18i8. The optical input can also be used as an S/PDIF input if
you need to connect equipment with an optical S/PDIF output. Note that the optical input is
disabled when sample rates of 176.4/192 kHz are in use.
16.
USB 2.0 port – Type C connector; connect the Scarlett 18i8 to your computer with the
cable supplied.
17. MIDI IN and MIDI OUT – standard 5-pin DIN sockets for connection of external MIDI equipment.
The Scarlett 18i8 acts as a MIDI interface, allowing MIDI data to/from your computer to be
distributed to additional MIDI devices.
18. SPDIF IN and OUT – two phono (RCA) sockets carrying two-channel digital audio signals in
and out of the Scarlett 18i8 in S/PDIF format. Like all the other inputs and outputs, signals at
these connectors may be routed in Focusrite Control.
19. External DC power input – power the Scarlett 18i8 via the separate AC adaptor (PSU) supplied
with the unit. Note that the Scarlett 18i8 cannot be powered via its USB port from the host
computer.
20. Power On/Off switch.
21. K (Kensington security slot) – secure your Scarlett 18i8 to a suitable structure if desired.