Square dance audio how to choose the right kind of square dancing?

Square dance audio is used in outdoor audio, that can be plugged into the power supply and has a rechargeable battery, because the square dance venue sometimes does not have power, only by the sound of the battery, such audio general electrical stores have, online also have, brand is also a lot of as for the selection of how big, depending on how many people dance team, a dozen people with a 2-inch speakers on the line, within 200 yuan. 50 people with a 6-inch sound on the line. People with 6-inch sound on the line. Don't turn up the volume when you put it on, or it's easy to shock the speakers. When you buy a stereo, you must state that it is used in outdoor square dancing, the business will understand that it is a rechargeable stereo.