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| PABX
Private Automatic Branch Exchange. A telephone switch located in a private users premises or OB truck. To make internal calls.
Page Boy
Receive only radio. Given often to presenters to hear an IFB feed. Now day’s usually a small radio scanner.
Patch Bay
A system of panel-mounted connectors used to bring inputs and outputs to a central point from where they can be routed using plug-in patch cords.
Patch Cord
Short cable used with patch bays. Also know as a cork.
PFL
Pre Fade Listen; a system used within a mixing console to allow the operator to listen in on a selected signal, regardless of the position of the fader controlling that signal.
Phantom Power
48V DC supply for capacitor microphones, transmitted along the signal cores of a balanced microphone cable.
Phase
The timing difference between two electrical waveforms expressed in degrees where 360 degrees corresponds to a delay of exactly one cycle.
Phono Plug
Hi-Fi connector developed by RCA and used extensively on semi-pro, unbalanced equipment.
Post Fade
If an Aux Send is said to be post fade then the level will change with the level of the channel fader.
PPM
Peak Programme Meter. Indicates peak level, not average. PPM 4 indicates 0dB.
Pre-Fade
Aux signal taken from before the channel fader so that the channel fader has no effect on the aux send level. Normally used for creating Fold back or Cue mixes.
PTB
Production Talk Back.
PZM
Pressure Zone Microphone. A type of boundary microphone. Designed to reject out-of-phase sounds reflected from surfaces within the recording environment.
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