An Introduction To PA Amplifiers

PA systems have become more and more commonplace because of the benefits they provide. One of the integral component of PA system is the PA amplifier. A PA amplifier is an audio amplifier which can take low frequency audio signals and boost them to high frequency which is more suitable for loudspeakers.

The power of a PA amplifier is such that it can boost a low quality audio signal of a few hundred micro watts, to an output as high as thousands of watts like in case of PA system being installed in music concert or in highly noisy environments like railway stations and airports.

The technology of amplifiers has witnessed some serious development over the years. The first PA amplifiers were based on vacuum tubes. These amplifiers lost the mass market favor in late 1960s. The emergence of cheaper and less bulky transistor based technology which comprises of solid state devices like FET and MOSFET made the PA amplifiers much more reliable and powerful.

Before you buy a PA amplifier:

Today when you go out to buy PA amplifiers you have to take care of certain basic considerations. There are four major considerations which make a good PA amplifier.

The foremost thing to be considered is Frequency Response. The PA amplifiers need an input signal. But not every input is usable with amplifier. The amplifier can only interpret a certain range of frequency and boost it. The ability to respond to a larger spectrum of frequency means that the PA amplifier has better frequency response.

Gain is another consideration in PA amplifier. Gain is the magnitude to which the strength of audio signal can be boosted. The more gain an amplifier can generate, the more dearly it is going to cost. Gain is measured in dB (Decibels). The more decibels in the output, the louder the output is going to be.

Distortion is another consideration PA amplifiers. Distortion is the degradation in sound quality that occurs due to the application of gain. Cheaper PA Amplifier would generate high levels of distortion and ruin the sound quality and clarity. It is therefore necessary to get PA Amplifier which offers low levels of distortion.

Noise comprises of those unwanted signals which enter the main signal because of interference caused by the flow of any other signal in the proximity. Noise may come from any source like electric cables, telephone lines or the like. The ability of PA amplifier to isolate noise from signal and the amplification of signal in comparison to amplification of noise (Signal to Noise ratio) is a key factor to be considered while you purchase a PA Amplifier.PA systems are easily available directly from a number of manufacturers via their website.

PA Systems