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8" versus 10" versus 12" versus 15"

One of the nice things about physics is that it works reliably. :) With regard to woofers, or so-called "subwoofers", there is no substitute for diaphragm (cone) area, because it all comes down to excursion and output. To produce a given amount of output at a given frequency, the cone must move a certain distance. The smaller the cone, the farther it has to move in order to produce the desired output. That's why larger woofers beat smaller woofers every time for good low bass.

There are very reliable formulae for calculating the required excursion based on the driver size, the frequency and the desired output. You can look at it from basically two perspectives: acoustic watts, or SPL. (SPL is a little more involved, since it is distance and room dependent.) I have them somewhere, but then I'd have to go upstairs and find them, and I'm too lazy to do that right now. :) It's easy enough to google it if you're interested, or maybe somebody like Tomservo or Bill Fitzmaurice or Presto has it handy and will post them.

:)


Edits: 05/03/17 05/03/17
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