Once upon a time, there were three bears, with three subwoofers. You probably can guess how this story ends.

Designing a subwoofer is simple: big box, big driver, powerful amplifier. You wind up with something the size of a small refrigerator, but it does the job. Designing a good miniature subwoofer is a bigger engineering challenge, but the recipe is also fairly well known: small box, very powerful amplifier, small drivers with lots and lots of excursion, or throw.
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