Owner's Manual

8
Rear Panel
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15. MIC/LINE INPUTS 3 to 8 – Combo type input sockets - connect further microphones or line
level signals via XLR or ¼” (6.35 mm) jacks as appropriate. Either ¼” TRS (balanced) or TS
(unbalanced) jack plugs can be used for line level signals.
16. LINE OUTPUTS 3 and 10 – eight balanced analogue line outputs on ¼” (6.35 mm) jack sockets;
use TRS jacks for a balanced connection or TS jacks for unbalanced. The signals available at
these outputs are defined in Focusrite Control, and can typically be used for driving alternative
speakers (i.e., midfield, nearfield, etc.), the additional speakers in a multichannel monitoring
system, or to drive outboard FX processors.
17. MONITOR 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. We recommend the use of
balanced connections wherever possible, to minimise grounding and hum problems. These
are also Line Outputs 1 and 2 of the system, and 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.
18. OPTICAL IN and OUT – two TOSLINK connectors, each carrying 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 and outputs 13 to 20 (at 44.1/48 kHz) to/from the Scarlett 18i20.
Note that the optical input and output are disabled when sample rates of 176.4/192 kHz are
in use.
19. WORD CLOCK OUT – a BNC connector carrying the Scarlett 18i20’s word clock; this may be
used to synchronise other digital audio equipment forming part of the recording system. The
source of sample clock synchronisation used by the Scarlett 18i20 is selected from Focusrite
Control.
20.
USB 2.0 port – Type B connector; connect the Scarlett 18i20 to your computer with the
cable supplied.
21. MIDI IN and MIDI OUT – standard 5-pin DIN sockets for connection of external MIDI equipment.
The Scarlett 18i20 acts as a “Break-out (and Break-in) Box”, allowing MIDI data to/from your
computer to be distributed to additional MIDI devices.
22. SPDIF IN and OUT – two phono (RCA) sockets carrying two-channel digital audio signals into
or out of the Scarlett 18i20 in S/PDIF format. These appear as Inputs 9 & 10 and Outputs 11 &
12 in Focusrite Control (but note the S/PDIF outputs are unavailable at 176.4/192 kHz sample
rates).
23. AC mains – standard IEC receptacle.