Owner's Manual

31
Clock Source
Interconnected digital audio equipment must always use the same reference clock source. Your
Scarlett interface is able to synchronise from three sources:
• Internal – the internally generated reference clock. This is the default selection.
• S/PDIF – the embedded clock signal in a signal at the S/PDIF IN connector. (Note that S/PDIF
may be applied to either the RCA connector or an optical port on the Scarlett 18i8 or 18i20.
Ensure that if you are using the optical port to receive S/PDIF, the signal from device you are
connecting has embedded clock.)
• ADAT – the embedded clock signal in a signal at the OPTICAL IN connector.
Whichever source is selected, the clock signal is available at the Scarlett’s WORD CLOCK OUT rear
panel BNC socket to allow synchronisation with other digital equipment (only on 18i20).
Digital Inputs
Scarlett models 18i8 and 18i20 have an additional selection available to determine how the S/PDIF
and/or ADAT modes are to be used.
IMPORTANT
Your interface will need to be restarted (i.e., power-
cycled) after changing the Digital Inputs setting in order
for input reconfiguration to take place.