Badminton Court Echo Control Design

I need a complete acoustic scheme for an indoor badminton court that currently suffers from a long, metallic echo. The priority is simple: bring the reverberation time down to a level where players can clearly hear the shuttle and coaches can speak without a PA system... (Budget: $30 - $250 USD, Jobs: Acoustical Engineering, Electrical Engineering, Electronics, Engineering, Mechanical Engineering, Sound Design)