Acoustic feedback is the ultimate limiting factor of every live sound system. It is the squeal that sets your teeth on edge and sends everyone diving for cover with fingers firmly stuffed in their ears.
So how does it happen? And how can it be avoided? While acoustic feedback is a commonoccurrence, it is possible to run and entire program feedback free.
To get technical for a second, acoustic feedback is “sound caught in a re-amplified loop.” It is usually a specific pitch of frequency emphasized by the room or space.