4.4K views · 25 reactions | Check out how I turn this Styrofoam cup into a mini stereo system! With two speakers on one end, sound percussion off of it is actually pretty good. Who knew that something so simple could be so useful? #diy #soundsystem #stereo #reels #prison | Larry Lawton Jewel Thief | Facebook

Mini Acoustic Levitator: small pieces of styrofoam become trapped between areas of higher pressure induced by high frequency sound waves. Ultrasonic transducers placed at the top and bottom are basically speakers that emit sound waves at a frequency of 43,000 Hz, which corresponds to a wavelength of 8mm for dry air. If the transducers are positioned just right standing waves are produce with nodes of low pressure at half wavelength intervals- and low mass objects like these foam pellets will be