The acoustic experiments discussed here are by no means novel; some can be traced back to the 18th century. What may be new to readers is the use of small, low-cost Bluetooth speakers and signal generator applications (apps) to perform them (Fig. 1).
References
1.
Inexpensive Bluetooth speakers, such as the ones pictured in this article, can be purchased from a number of outlets including DHgate.com, Five Below discount chain, and AliExpress.com.
2.
A Google search for free signal (tone) generator applications will yield many options.
3.
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2022
Author(s)
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