Please teach the gods, I open a walled barbecue garden, outdoor three or four hundred square feet, want to match with a microphone trolley speakers to sing to the guests, v and u section which is nece

Please teach the gods, I open a walled barbecue garden, outdoor three or four hundred square feet, want to match with a microphone trolley speakers to sing to the guests, v and u section which is necessary 8 inch battery audio volume to the maximum, there will be broken sound appears, so the volume will be opened to moderate. In this case, people 100 meters away from the stereo to hear the sound should be very small. It is recommended that you buy a 12" or 15" or 18" stereo. the $258 8" stereo is only good enough for a V-band wireless microphone. If you want to peripheral people also use wireless microphone singing or shouting words, it is best to use the U section of the wireless microphone, the propagation distance is far, the signal is stable.