The use of PA system to address a rally or a public system has been on the rise. With effective equipment in the market the systems have been used for many more purposes. The equipment that is available in the market is of great quality and they offer much effectiveness when it comes to PA system. From loudspeakers to amplifiers to microphones, everything is state of the art and they are highly recommended for any such proposes.
Since the inception of microphone in all the PA systems, it has been widely accepted and acclaimed. The next thing is to set up and equalize the system. So, to start with, you have to turn off all the sound devices and go for auto equalizers.
Once the wireless microphone and other equipment are working, make sure to test the sound with different types of test songs.
Resolve the distortions issues and you are good to go. Adjust all the frequency as per needed.
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Source: http://portable-sound-system.blogspot.com/2016/02/equalize-sound-for-pa-system.html