PreSonus ACP88 - Manual (Page 15)

CONTROLS & CONNECTIONS
12
• Output
The output jack accepts balanced tip-ring-sleeve or unbalanced tip sleeve connectors.
The output will deliver up to +24 dBu in signal level, balanced or unbalanced.
• +4/-10 Switch
This switch adjusts the internal operating level of your ACP-88 when it is connected to
line level (0 dB = -10 dBU) gear. With this switch in the ‘-10’ position, the signal is
adjusted by 11.2 dB so that it can be processed at the lower noise floor of your ACP-
88’s internal circuitry. The signal level is lowered on the way out to match with your line
level gear’s input. When the switch is in the ‘+4’ position, the signal is not changed since
this matches the optimum internal operating level of your ACP-88.
• Compressor Sidechain
The Sidechain jack on each channel interrupts the signal that the compressor is using
to determine the amount of Gain reduction to apply. When no connector is inserted into
this jack, the input signal goes directly to the compressor’s control circuitry. When a
connector is inserted into this jack, the signal path is broken. If you have inserted a ¼
inch tip-ring-sleeve (TRS) connector, the input signal is sent back out of the ACP-88 via
the ring of the
connector. This signal can then be processed by an equalizer for
example to reduce sibilance 9de-essing) in a vocal track. The signal is then returned to
the unit via the tip of the connector. The signal sent via the ring could be that of a
narrator or vocalist. In this application, the audio that you are passing through the
compressor will automatically ‘duck’ when the narrator speaks or vocalist sings.
• Gate Sidechain/Key Insert
The Gate sidechain jack accepts a tip-ring-sleeve connector and is used to open the
Gate from either a modified version of the signal passing through the Gate or some
other external source. For example, the Gate may be Keyed from a version of the kick