Earplugs, as far as I can tell, hold the key to understanding sound in its various forms. I took apart one of them (I have four pairs of these, and on average, the first pair only lasts a year). The diameter of the speaker is comparable to that of plug-ins, while the form factor of the plugs is only half as large in some of the speakers. It doesn't really matter how big anything is, but having a larger one is preferable to having a smaller one.
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