Owner's Manual

18i8 only – S/PDIF Source: this model accepts a S/PDIF signal at either the RCA connector or the

optical ADAT input port. Note that when the optical port is used for an S/PDIF input, it cannot be used

for ADAT inputs. Also note that the optical ports are disabled at sample rates of 176.4 and 192 kHz.

18i20 only – Digital I/O Mode: this model supports three different Digital I/O Modes, which

determine how the interface’s S/PDIF input and output, and the four optical ports, function. The

mode to be used is selected from the Digital I/O Mode dropdown. The three modes are:

• S/PDIF RCA – this is the default mode: the 18i20 will send and receive S/PDIF signals via the

coaxial connectors.

• S/PDIF Optical – use this mode if you need the 18i20 to send or receive S/PDIF signals via

an optical connection. If you have selected S/PDIF as the clock source (see above), then the

18i20 will use an S/PDIF signal applied optically at an ADAT port as the clock source.

• Dual ADAT – this mode lets you send and receive eight channels of audio via the ADAT ports at

88.2 or 96 kHz sample rate. Note that in this mode, S/PDIF I/O is disabled at all sample rates,

and will not be available at either the RCA connector nor via an optical port.

Further details can be found in the section “Digital I/O Modes” in the Scarlett 18i20 User Guide.

TROUBLESHOOTING

For all troubleshooting queries, please visit the Focusrite Help Centre at support.focusrite.com/

where you will ﬁnd articles covering numerous troubleshooting examples.

Focusrite is a registered trade mark. Focusrite Control and Scarlett are trade marks of Focusrite

Audio Engineering Limited.

All other trade marks and trade names are the property of their respective owners.