Digital Synchronisation; Clarett+ Octopre As Clock Leader; Clarett+ Octopre As Clock Follower; Digital Inputs - Focusrite Clarett+ OctoPre User Manual

DIGITAL SYNCHRONISATION

Two synchronisation options are available:

CLARETT+ OCTOPRE AS CLOCK LEADER:

Connect the OctoPre to the receiving device via the OPTICAL OUT port(s) and ensure the receiving
device is set to source its clock from its ADAT input (and the sample rates on both devices match).
On the OctoPre, SYNC should be set to INTERNAL and the LED will illuminate.
An alternative method is to synchronise the receiving device to the Clarett+ OctoPre's WORD CLOCK
OUT using a BNC cable. The receiving device's sync source will need to be set to its external word
clock input.

CLARETT+ OCTOPRE AS CLOCK FOLLOWER:

Connect the OctoPre to your interface via the OPTICAL OUT port(s) and connect a BNC cable from
the digital system's word clock leader to the OctoPre's WORD CLOCK IN connector (also ensuring the
sample rates on all devices match).
On the OctoPre, SYNC should be set to W/CLOCK and the
LED will illuminate.

DIGITAL INPUTS

Use the OPTICAL IN ADAT port(s) [19] if you need to convert digital audio (e.g., the output of a DAW)
to analogue, using the Clarett+ OctoPre's ADAT > LINE mode.
The right-hand port can receive 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 receive four channels of audio. The right-hand
port carries Channels 1 to 4, the left-hand port carries Channels 5 to 8; you need two TOSLINK
cables to receive all eight channels.
At 176.4 kHz or 192 kHz sample rates, each port can receive two channels of audio. The right-hand
port carries Channels 1 and 2, the left-hand port carries Channels 3 and 4. The OctoPre is restricted
to four channels of digital audio at these sample rates.
Use the SAMPLE RATE switch [9] to select the desired frequency. It is essential the sample rate
selected on the Clarett+ OctoPre matches the sample rate set on the transmitting digital device.

AIR MODE

An important feature of all models in the Clarett+ range is the analogue preamplifier design. The
circuitry includes an AIR function, individually selectable on each channel. AIR subtly changes the
preamp's frequency response to model the impedance and resonance characteristics of Focusrite's
classic transformer-based ISA mic preamps. When recording with microphones, you will notice an
enhanced clarity and definition in the mid frequency range, just where it is most needed for vocals
and many acoustic instruments.
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