Avid Technology DigiDesign PRE, Руководство пользователя

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Chapter 2: Hardware Overview and Stand-Alone Operation
9
Insert Switch and LEDs
This switch enables insert points on individual
channels. When lit (yellow), Insert LEDs indicate
which channels have their insert point enabled.
PRE’s back panel has eight pairs of send and return
jacks for inserting external processors (such as
compressors or EQs) in the audio path. Insert send
levels are post output trim.
Pad Switch and LEDs
This switch applies an input pad to individual
channels to reduce input sensitivity by –18 dB.
When lit (green), Pad LEDs indicate which chan-
nels have Pad enabled.
Phase Switch and LEDs
This switch applies phase reversal to individual
channels. When lit (green), Phase LEDs indicate
which channels have phase reverse enabled.
High-Pass Filter Switch and LEDs
This switch applies a high-pass filter to individual
channels. When lit (green), HPF LEDs indicate
which channels have the high-pass filter enabled.
Each PRE channel includes a high-pass filter with
a center frequency of 85 Hz and a roll-off of –18
dB/octave. Use the high-pass filter to remove mi-
crophone proximity effects, hum, rumble, wind,
and other low frequency sounds.
Channel Mute Switches and LEDs
Each PRE channel has a dedicated Mute switch to
mute input signal. The respective Mute LED lights
when muting is enabled.
Channel Select Switches and LEDs
These switches are used to focus one or more chan-
nels to adjust their controls. When lit (green), the
Channel Select LED indicates that the channel’s
controls can be adjusted.
To select multiple channels for adjusting, first
press the Shift key on the left-hand side of the unit,
then press the Select switches for corresponding
channels. To return to single channel selection,
disengage the Shift key, then press the Select
switch for the individual channel you want to
change.
The following channel controls can be adjusted:
• 48V Phantom Power; see “48V Switch and
LEDs” on page 8.
• Phase Reverse; see “Phase Switch and LEDs”
on page 9.
• Pad; see “Pad Switch and LEDs” on page 9.
• Insert; see “Insert Switch and LEDs” on page 9.
• High-Pass Filter; see “High-Pass Filter Switch
and LEDs” on page 9.
• Mic/Line/Instrument Source Switching; see
“Source Switch and LEDs” on page 7.
• Input Gain; see “Gain/Param and Input Gain” on
page 14.
When PRE is powered off, channel select states are
stored in memory and are subsequently restored at
power up.
Line/Inst 1 and 2
The front panel includes two 1/4-inch
balanced/unbalanced TRS jacks, with Tip wired
hot (or “+”), Ring cold (“–”), and Sleeve ground.
These jacks mirror Line/Inst Inputs 1 and 2 on the
back panel. Connecting to the front panel Line/Inst
input will break a connection made to the respec-
tive back panel Line/Inst input.