Rear Panel - Focusrite Scarlett 18i8 User Manual

10. MUTE – push this button to mute Outputs 1 and 2. The button illuminates when MUTE is
active.
11. HP 01 and HP 02 – connect one or two pairs of stereo headphones at the two ¼" (6.25 mm)
TRS jack sockets below the controls. The headphone outputs always carry the signals that
are currently routed to analogue outputs 3/4 and 5/6 (as stereo pairs) in Scarlett MixControl.

Rear Panel

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The Rear Panel includes connectors for further line inputs, the main monitor outputs, plus USB,
MIDI and ADAT optical ports.
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 Scarlett MixControl.
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.
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 or
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.
18. External DC power input – power the Scarlett 18i8 via a separate AC adaptor (PSU) rated at
12 V C and 1 A. Note that the Scarlett 18i8 cannot be powered via its USB port from the host
computer.
19. Power On/Off switch.
20. Kensington security slot– secure your Scarlett 18i8 to a suitable structure if desired. Please
see http://www.kensington.com/kensington/us/us/s/1704/kensington-security-slot.aspx
further information on how to use this feature.
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