Power Amplifiers Buying Guide: You need a power amplifier to drive your PA system’s passive speakers. Here we’ll help you find the power amp at the wattage you need. Checkout the various value-for-money options that offers plenty of THUMP to your sound
Why You need One?
An audio power amplifier is basically an amplifier that amplifies low-power audio signals to a level suitable for driving loudspeakers. The power amplifier receives audio signal from the mixing board or signal processor and magnifies it, giving it the power it needs to drive your speakers and entertain your audience.
You need one to amplify the original sound signal so that it can comfortably drive a loudspeaker. In a typical audio playback chain, it usually is the final component.
In most audio / DJ systems, this original signal source typically comes from a pre-amp or a signal processor.
Understanding power amplifiers
Things to Watch Out For?
There are a couple of things that can alter the sound, especially of you operate the power amps outside their advertised power ratings. These are:
When considering a power amp, a good rule of thumb is to consider an amplifier that can deliver power equal to twice the speaker’s program rating. So if a speaker has a “nominal impedance” of 8 ohms and a program power rating of 350 watts, you should buy an amplifier that can produce 700 watts into an 8-ohm load. For a stereo pair of speakers, the amplifier should ideally be rated at 700 watts per channel into 8 ohms. Using an amp with some extra “headroom” (difference between the normal operating level of an amplifier, and the maximum level that the amp can pass without distorting) will help assure that only clean, undistorted power gets to your speakers.
Here are some of the important features found on most of these power amps: