The SolidDrive converts almost any solid surface into a speaker by shaking it at the right frequencies. The audio signal is converted into vibrations that are transferred into a solid material such as glass, drywall, granite, wood, etc.
The advantage is in de-cluttering your room by eliminating the need for speakers and their wires. The disadvantage is the limited frequency response of 150-5,000Hz.
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It’d be nice to have your mattress play soft music to lull you to sleep.
Or it’d be nice to have your mattress shake you awake in the morning.