|Can you break glass with sound?
How loud does the sound have to be?
This depends on the glass. But for the glass we used the sound level was in the region of 135-140dB. To generate this needs very powerful loudspeakers - we used a hefty public address system. One loudspeaker wasn't enough, so we crowded two around the glass. We also placed the glass very close to the drivers to ensure the sound was as loud as possible. We also placed the glass and loudspeakers in a Perspex box. This enclosure increases the sound level generated, and also keeps the glass from going everywhere. The sound levels generated are loud enough to be a risk to hearing.
Is it safe?