Where are the speakers installed? 30 m x30 m, 10 m high indoor gymnasium. How to install a stereo can better avoid echo problems?

A house 30 meters by 30 meters will have a serious standing wave (standing wave is a phenomenon of spatial vibration. As long as the distance between two opposite parallel walls is equal to an integer multiple of half wavelength, it will produce * * * vibration, that is, standing wave).

The sound of the stereo is lower (as long as you can hear music) and the echo is smaller; If the volume is turned up, only install sound-absorbing materials on indoor walls and floors. The more sound-absorbing materials, the better the effect.

The location where the speaker is installed is not the main problem (you can try multiple locations to choose the best location).