A public address system is used to electronically amplify sound using a mixer, amplifier, speakers amongst other devices.
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The unit is also very durable and made to last.Its easy to use, adjustable height, unique design and you can take it any place where you want because it can be folded easily and also lightweight.
The Yamaha Stage Pass 300 Portable PA Program And
These (and the more expensive ones) all have on board electronics in the form of an equalizer and volume controls.