Owner's Manual

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Rear Panel
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12. 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.
13. MONITOR OUTPUTS 1 and 2 – two balanced analogue line outputs on ¼” (6.35 mm) jack
sockets; use TRS jacks for a balanced connection or TS jacks for unbalanced. These will
generally be used for driving the main L and R speakers of your monitoring system; however,
the signals at the outputs may be defined in Focusrite Control.
14. 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 (11 to 18) to the Scarlett 18i8. Note that the optical input is disabled when sample rates
of 176.4/192 kHz are in use.
15.
USB 2.0 port – Type B connector; connect the Scarlett 18i8 to your computer with the
cable supplied.
16. MIDI IN and MIDI OUT – standard 5-pin DIN sockets for connection of external MIDI equipment.
The Scarlett 18i8 acts as a “Break-out (and Break-in) Box”, allowing MIDI data to/from your
computer to be distributed to additional MIDI devices.
17. 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. These are essentially Inputs 9 and 10 and Outputs 7
and 8 to/from the unit. Like all the other inputs and outputs, signals at these connectors may
be routed in Focusrite Control.
18. 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.
19. Power On/Off switch.
20. K (Kensington security lock) – secure your Scarlett 18i8 to a suitable structure if desired.
Please see www.kensington.com/kensington/us/us/s/1704/kensington-security-slot.aspx
for further information on how to use this feature.