An acoustic isolator to keep sound from drums and cymbals from leaking into other instruments' mics.
Shown below is a very elaborate one. Most are just PlexiGlas sheets hinged together without a roof or back wall.
Perdue Acoustics Drum Booth - Drum Shield Kit
Shown below is a very elaborate one. Most are just PlexiGlas sheets hinged together without a roof or back wall.
Perdue Acoustics Drum Booth - Drum Shield Kit
