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Online Guide Choosing a PA System
Mixers

 

This is where it all comes together. All the different signals come in, levels are
BalancedTerm used to describe a system of audio connection that employs phase inversion noise cancellation. Using two signal wires and an earth, the audio is split and phase inverted in the second signal wire. On reaching the destination the second signal is re-inverted and combined with the first. Any electromagnetic interference is picked up equally by each signal cable and so will be cancelled out by the phase inversion. A balanced line requires balanced equipment at both ends.
balanced
and
EffectsGeneral term applied to audio processors for dynamics, time, ambience and equalisation whether in the form of 19" rack units, guitar floor pedals, or software plug-ins.
effects
applied, before forwarding the treated signals to the
AmplifierA device for increasing the power of a signal by taking power from a supply and shaping the output to match the input signal.
amplifier
, and also to the
Monitor1) Recording studio loudspeaker. 2) Stage loudspeaker, usually wedge-shaped, facing the performers so that they may hear themselves. 3) Computer display screen.
monitors
. Once again, remember to give yourself as much capacity as you can afford.

The
KeyAn additional input on a dynamics processor such as a compressor or noise gate, enabling the dynamics of one signal to control the level of another. This can be used for many functions, including ducking (compressing a music signal when a DJ or announcer speaks), synchronised gating, and (in conjunction with an equaliser) de-essing.
key
considerations are:
  • The number of channels you will need.
  • The number of aux sends you will need for
    EffectsGeneral term applied to audio processors for dynamics, time, ambience and equalisation whether in the form of 19" rack units, guitar floor pedals, or software plug-ins.
    effects
    and ‘foldback’.
  • Storage, protection and portability - include some sort of flight case in your budget, with castors if you want an easy life!


Analogue or digital?

This has always been more than a question of budget, but since the price differential between analogue and
DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
digital
mixers has fallen, it has now become a choice that many are facing.

Digital mixer


Yamaha LS9-16

DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
digital mixer

In terms of
AudioGenerally used to mean "sound"; technically it describes periodic fluctuations of air pressure or electrical energy at frequencies and amplitudes within the human range of hearing; sound, or electrical energy that represents sound; acoustic, mechanical, or electrical frequencies corresponding to normally audible sound waves.
audio
quality, there’s no clear winner here – there are plenty of
DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
digital
ConsoleA device through which audio signals are routed for mixing, monitoring, processing and re-routed for either recording, amplification or both. A console contains a number of channel strips and a selection of auxiliary, monitoring and main outputs.
consoles
that sound better than many analogue
ConsoleA device through which audio signals are routed for mixing, monitoring, processing and re-routed for either recording, amplification or both. A console contains a number of channel strips and a selection of auxiliary, monitoring and main outputs.
consoles
, and vice-versa – other than cost, the real issue is one of functionality versus user-interface.
DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
Digital
ConsoleA device through which audio signals are routed for mixing, monitoring, processing and re-routed for either recording, amplification or both. A console contains a number of channel strips and a selection of auxiliary, monitoring and main outputs.
consoles
will typically offer the ability to store all their settings in ‘scenes’ which can be switched between instantly (or sometimes faded), and most offer a plethora of built-in
EffectsGeneral term applied to audio processors for dynamics, time, ambience and equalisation whether in the form of 19" rack units, guitar floor pedals, or software plug-ins.
effects
, dynamics processing and
RoutingThe method of passing signals from a source to a destination for mixing or processing, either via an audio console's internal busses using routing switche, or with a patchbay using patch cables.
routing
possibilities. However this is normally at the expense of the user
InterfaceA device enabling the connection of two or more devices, or types of devices. Examples include MIDI interfaces, for connecting MIDI equipment to a computer, and audio interfaces.
interface
, where the analogue
ConsoleA device through which audio signals are routed for mixing, monitoring, processing and re-routed for either recording, amplification or both. A console contains a number of channel strips and a selection of auxiliary, monitoring and main outputs.
console
is the clear winner, having one knob, button or
FaderVariable level control in the form of a slider usually found on audio mixing consoles, allowing attenuation of audio signals, also used on control surfaces for control of a variety of parameters.
fader
for each and every function on the desk –
DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
digital
models on the other hand will generally have multi-function controls,
Master1) The final version of an audio recording or album that has been prepared for release. 2) The physical medium on which this recording is stored or transferred, such as a glass master CD, CDR or vinyl master from which a production run will be replicated or pressed.
master
controls for EQ etc which have to be pre-selected per channel, and multi-layer menus accessed via small screens. As a rule of thumb though, the bigger the system becomes, the more the advantages of
DigitalAll digital equipment, formats and systems represent audio in numerical code or form. Digital information is a precise way of expressing any of information that can be quantified in some way.
digital
shine through.

 

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índice:

[Conteúdo] [Sound Sources & Signal Paths] [Microphones] [Cabling] [Mixers] [Amplifiers] [Loudspeakers] [Introduction to Acoustics] [Putting it all Together] [Examples] [Glossary] [Conclusion] [Hotdeals] [Feedback]