Power Amplifiers Up To 300 W (4 ohm) finder
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Thomann's Cool Online Guides: PA-Amps

2. Overview

You could sum up the whole idea of a PA power
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
in a single word - sound. The power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
is a crucial part of a musician’s live sound. Clarity and quality are more important than
Volume1) In audio and music, the loudness or amplitude of a signal. 2) In computing, a fixed amount of storage space, addressed as a single entity ('C:', 'D:' etc). A physical drive may contain more than one volume, but a single volume may also span more than one drive!
volume
- even a low
Volume1) In audio and music, the loudness or amplitude of a signal. 2) In computing, a fixed amount of storage space, addressed as a single entity ('C:', 'D:' etc). A physical drive may contain more than one volume, but a single volume may also span more than one drive!
volume
sound that is distorted is uncomfortable to listen to, whereas a rich, clear sound can fill a large room without driving away the audience.

Technically, a power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
- sometimes known as an output stage - is there to amplify the signal from the mixing desk so that it’s strong enough to drive the PA speakers. The ideal power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
is small and light, but very powerful. It should also be highly efficient, so that it does not require excessive cooling. Inevitably, compromises must be made between all these factors, but there are some superbly engineered models available today that deliver substantial power efficiently and in a manageable form.

Power amps that are well matched to speakers have relatively little impact on the total quality of the sound.
MicrophoneA device which converts airborne sound into an electrical signal.
Microphones
,
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 EQ will have a much greater effect on the fine detail of the sound spectrum, although the more complex that spectrum is, the harder the amp’s job will be.

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
to a good stage sound is consistent stable delivery of the whole signal to the speakers. So the power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
, receiving signals of varying frequencies, must be able to handle a complex load, and move it smoothly out to the front line. At the same time, it must accommodate the load represented by the speakers themselves, a factor made more complicated by the quality of the connecting cables. As far as they are concerned there is a simple rule - the shorter, the better.

DistortionIn most cases distortion is an undesirable alteration to a signal which occurs when a piece of equipment is driven with a input level that is too high for its operating level. Sometimes, as in the case of guitar distortion, this can be an intentional and desirable effect.
Distortion
and
ClippingAudio distortion caused by overloading, visible as flattened waveform peaks at the maximum possible voltage.
peaking
are the great enemies - your power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
needs sufficient capacity to deal with the highest loads you expect to generate, without delivering a signal that produces a broken sound as soon as it
Hit1) A successful recording. 2) A single sampled percussive sound, as opposed to a loop.
hits
the speakers. Naturally, the capacity required depends on the kind of music you are making. You can assume that a heavy metal band will need something more substantial, whereas a string quartet could probably make do with something fairly lightweight, although whatever
Volume1) In audio and music, the loudness or amplitude of a signal. 2) In computing, a fixed amount of storage space, addressed as a single entity ('C:', 'D:' etc). A physical drive may contain more than one volume, but a single volume may also span more than one drive!
volume
you are playing at, it’s always advisable to have plenty of ‘headroom’.

So you need to consider your requirements carefully, and strike the right balance between performance, portability, and price. Over the next few pages, we’ll give you all the help we can in selecting the right
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
for your stage setup.

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