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Glossary of PA Terms - Z |
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The glossary pages provide definitions for over 2270 PA-related terms. If you can't find the term you are looking for, or would like any of the existing definitions to be expanded, please email me − likewise of course if you find any errors in the links etc. Use of this information is conditional upon acceptance of the Disclaimer on the PAforMusic home page.
Z * Zenith * Zero * Zero-crossing * Zero dB * Zero level * Zero out * Zip cable * Zip tie * Zobel network
The definitions for these terms are given on the assumption of their use in the context of PA systems; many of the terms have more general meanings when used in a wider context. Where more than one definition is given for a term, the definitions are numbered (1), (2) etc.
Some of the definitions themselves use terms (such as "signal") in a specific way − most of these are links (just the first time they are used, in each definition), so just click on them to see the meanings that are intended.
Zenith
The vertical angle of the front of a tape
head relative
to the plane of the tape; its 'front-to-back' tilt.
For proper contact with the tape and for even head
wear it is essential that this angle is as close to
zero as possible.
Compare Azimuth.
Zero
To set all controls to their 'normal' or 'zero'
positions. For a fuller definition see
Normalise.
Zero-crossing
The points in a signal
waveform at which the
instantaneous value
of the quantity concerned
(usually the voltage)
passes through zero as it crosses from a negative-going
excursion to a positive-going excursion, or
vice-versa. See also
Crossover
distortion.
Zero dB
See 0 dB
(several definitions).
Zero level
Usually refers to the agreed
reference level
of a signal −
i.e. its '0 dB'
level − or to the reference setting of a level
control. For examples see
0 dB (1).
An indicator marked 'Zero level' (e.g. on some
mixers) will typically
illuminate when the relevant reference level has been
reached (and may remain illuminated at higher
levels).
For further information see the
Decibels page.
(Exceptionally, may be used to
mean the complete absence of any signal.)
Zero out
To set all controls to their 'normal' or 'zero'
positions. For a fuller definition see
Normalise.
Zip cable
See
Figure-of-8 cable.
Zobel
network
A series
resistor and
capacitor connected across
the speaker output of an
amplifier (usually
internal to the amplifier) to give an
impedance which falls with
frequency
and therefore compensates to some degree
for the rising impedance of the
connected speakers by maintaining
a more constant overall load
impedance at the output of the amplifier.
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There are no more definitions on this page. (The space below is to facilitate linking to the last few terms above.)
0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
This page last updated 25-Jun-2010.