It is device which is used to increase the voltage, current, or the power of a particular signal. They are now commonly used in various electronics media and wireless communication devices and also for broadcasting the signals. It is the widely used electronic device in the world and a basic building block of a various electronic circuits. Basically its work is to increase the power of a signal thereby making it stronger than the given input.
There are simply two types of amplifiers as power amplifiers and weak signal amplifiers. The former used in wireless receivers and the later one used in wireless transmitters and in higher audio devices. Power output and efficiency are the two major key points while considering amplifiers.
When you are matching power amplifiers to the power amplified speakers there are some of the things that you need to be considered before buying any guitar amplifier. The most common thing to be considered is that picks an amplifier that can deliver power equals to twice the power rating of the speakers.
Things to be noted down:
Power handling capacity
There are two ways that will result in the blowing up your speakers if t is under powered or overpowered. When the speaker is under powered and meanwhile the amplifier is turned up it can produce a sound wave that can melt the coils of your speakers. On the other hand if amplifier is more powerful than the handling capacity of speaker then it will clip the speakers. So you have to be sure that the amplifier you are buying is neither low power nor of high power so that they can be matched up with your speakers.
Matching Amplification power and speaker power:
If your speaker is of 150 W RMS that means it can do 150W RMS per channel. So chose the amplifier that would be capable of delivering about 80 to 150 % of the speakers or subwoofers RMS rating. So ads up all the RMS watts for the speakers as well as of the subwoofers you want to attach with the amplifier and it should be within 25 % of the up or down side from that particular number.
It is the measure of the ability of an amplifier to follow its input signal or it can be defined as the rate of change of an amplifier’s output voltage with the input voltage. Its unit is volt/microsecond. So slew rate is an overloading condition and this should be avoided.
A loud speaker keeps on vibrating even after the signal has stopped, due to their inertia. This effect is called ringing or time swearing. In this way speaker produces sound waves that are not a part of original input signal. For this amplifier should be chosen of the quality that can exert control over the loudspeaker thereby reducing its ringing effect. So damping is the ability of a power amplifier to control the motion of a loudspeaker which is measured in damping factor and its value is equals to the load impedance divided with the amplifier’s output impedance.