Focusrite OctoPre Digital Option Operation, Руководство пользователя

Страница: 5 / 20

5
Using the OctoPre MkII
Combo Inputs
All eight of the audio inputs use Neutrik Combo connectors. These can accept male XLR connectors, TS (un-balanced) and TRS
(balanced) jack connectors.
If an XLR cable is used, then the pre-amp will automatically set to microphone level.
If a Jack cable is used, then the pre-amp will be at line level. For instrument signals connected to inputs 1 and 2 use the Inst button
to switch to high impedance instrument level.
Pre-amp Gain
The gain of each pre-amp should be set accordingly to the level of the input source. Use the LED metering to monitor the signal level
of each pre-amp.
Start with the preamp gain set to minimum. Ask the recording artist to play at the loudest level required by the performance.
If the LED metering is already showing a high level, then switch on the Pad for that channel.
Then slowly increase the gain until the signal level reaches orange (-3dB).
Then lower the gain by a few dB.
This should ensure that the signal level is unlikely to ever reach red (0dB) and overload the analogue to digital converters.
Phantom Power
The two phantom power switches turn on +48V phantom power to Mic inputs 1-4 and 5-8. Phantom power is required for most
condenser (capacitor) microphones. If phantom power is only sent to the XLR connectors on the combo input, so if a group of 4
preamps is shared between e.g. mic and line level signals, +48V is only sent to the microphones.
Dynamic microphones do not require phantom power, but most will operate with phantom power supplied.
Ribbon microphones do not require phantom power and may be damaged if supplied with phantom power.
If you are unsure about your microphone DO NOT supply phantom power until you have confirmed the specifications with the
manufacturer.
Line Outputs
Use the line outputs to connect the OctoPre MkII to the line inputs of any analogue device.
The OctoPre MkII will accept either TS (un-balanced) or TRS (balanced) jacks.
TRS jacks will give a maximum signal level of +16dBu whereas TS jacks will give a maximum level of +10dBu.