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Online Guide PA-Amps
Protective Circuits

 

Many power amps have built-in protection against the overloads that can harm them. Some also incorporate protection for the speakers. Specifications vary between manufacturers, but the
PresenceThe ability of high frequencies in a sound to 'cut through' a mix. Presence controls usually boost frequencies between 3-5kHz.
presence
of protective circuits can save you a fortune if they prevent disaster. They also help to ensure that the
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
performs to its optimum, delivering a steady, stable stream of signal.


Heat Protection

If your
FilterA circuit used to remove or accentuate frequencies in a sound source. Common types are found on mixing consoles equalisation, synthesizers and dedicated processors such as graphic equalisers.
filters
are clogged, the
AIRSome artists and producers believe that AIR - Always In Record - is a valuable technique, because it can capture moments of musical magic that may otherwise go unrecorded. It simply means that the tape or hard drive never stops running during a session.
air
supply is limited, or the
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
overheats for any other reason, this type of circuit will shut things down before it’s too late.


Short-circuit Protection

Protects the
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
and its transistors from the shock of a short circuit.


Direct
CurrentThe flow of electrons or charge in an electrical device, measured in amperes (amps); defined as the voltage applied divided by the resistance in the circuit.
Current
Protective Circuit (DC)

A circuit breaker that protects each DC channel.


Low
ImpedanceThe term for electrical resistance when applied to AC current.
Impedance
Protection

Shuts down the
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
if the attached speakers are of too low an
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
value.


No-load Operation Protection

Prevents damage if the
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 turned on without speakers attached.


Very High FrequencyA range of frequencies (between 30MHz and 300MHz) used for radio transmission (including FM), two-way communication (walkie-talkies etc) and cheaper radio mic systems.
VHF
Limiter

Avoids damage caused by frequencies outside the audible range.


Clip Limiter

Automatic regulation of the incoming signal prevents
ClippingAudio distortion caused by overloading, visible as flattened waveform peaks at the maximum possible voltage.
clipping
.

 

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