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How to break a glass with your voice
Prepare your glass shattering station.
Remember, success in this task will result in broken glass, so you might want to practice in a room with hard floors to make clean up easier. Choose a room with good acoustics and little to no echo.
You'll also need a power outlet to plug in your amp if you've chosen to use a microphone, as well as a platform on which your glass and amp can sit. If you plan on using your voice alone to shatter your glass, you'll only need a sturdy platform to place your glass upon.