Line Outputs; Led Metering; Digital Outputs - Focusrite Scarlett OctoPre User Manual

Line Outputs

By connecting the line outputs of the Scarlett OctoPre to the analogue line inputs of a mixing console
(or any other device), the unit can be used either as a purely analogue, 8-channel microphone
pre-amplifier.
The line outputs are balanced: for a balanced connection use ¼" 3-pole (TRS) jacks, or ¼" 2-pole (TS)
jacks for an unbalanced connection.
The maximum output signal level is +16 dBu (balanced), or +10 dBu (unbalanced).

LED Metering

The eight five-segment LED meters show the level of the signal at the input to the analogue-to-
digital converters - i.e., after both the pre-amplifier and compressor stages.
The segments illuminate at the following signal levels: -42 dBFS, -18 dBFS, -6 dBFS (green),
-3 dBFS (yellow), and 0 dBFS (red).
When using the digital ADAT outputs, you should ensure that the channel gain settings (with or
without PAD selected, as necessary) are such that the signal level never reaches 0 dBFS – i.e., the
red LED should never light.

Digital Outputs

Use the ADAT OUT optical port(s) [13] to connect the Scarlett OctoPre to the ADAT input(s) of an audio
device using TOSLINK optical cable(s).
The right-hand port (as viewed from the rear of the unit) can transmit eight channels of audio at
44.1 kHz or 48 kHz sample rate via a single optical cable.
At 88.2 kHz or 96 kHz sample rates, each port can transmit four channels of audio. The right-hand
port carries Channels 1 to 4, the left-hand port carries Channels 5 to 8; thus two TOSLINK cables are
required to transmit all eight channels.
At 176.4 kHz or 192 kHz sample rates, each port can transmit two channels of audio. The right-hand
port carries Channels 1 and 2, the left-hand port carries Channels 3 and 4. The Scarlett OctoPre is
restricted to four channels of digital audio at these sample rates; the outputs of Channels 5 to 8 are
not available via the ADAT ports.
Use the SAMPLE RATE switch [7] to select the desired sample rate frequency. It is essential that the
sample rate selected on the Scarlett OctoPre matches the sample rate set on the receiving digital
device.
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