How to eliminate audio feedback
Audio feedback is a sound loop that exists between an audio input (e.g. a microphone) and an audio output (e.g. a power amplified loudspeaker). When the microphone is located too near to the speakers, the signal travels in this continuous loop causing audio feedback.
The loop must be broken in order to stop the audio feedback - usually moving the microphone further away from the speakers solves this problem.
Another trick for breaking temporary, short audio feedback is throwing the Cube mic in the air or rotating it. This enables the Automute function, which will cut the audio feedback loop. If the audio feedback continues, adjust the speaker and microphone placement.
Using Cube mic and built-in ceiling speakers
The situation is a bit more complicated when the speakers in the room where the Cube is used are mounted in the ceiling. Generally, any microphone, when situated near a loudspeaker or directed towards it, will cause a feedback loop - the mic will catch the audio coming from the speakers.
When it comes to a setup with ceiling speakers, it is very hard to adjust the placement of the mics (especially with Cube - a microphone that is meant to be thrown around in the audience). For this reason, we don't recommend using Cube mic in a room with ceiling speakers, as it is almost impossible to avoid audio feedback.