Quote:
Originally Posted by Nas Escobar
All is good, it's not ignorance on your part.
The smaller the sub is, the less cone area it has.
I'll riddle it to you like this. 1 15" sub will punch more hard than 2 12" subs using the same air space (for this example, lets use 2.0 cubic feet). So while you need more room to have 2 12"s at 2.0 ft2, you can be more efficient with one 15" because the bigger the cone area, the more air it can produce/compress. Therefore the smaller cone areas of 8 and 10 don't have the power to compress the same air in a 2.0ft2 box as a 15 or a 12 can. In fact, there is such thing as a box that's too big that it can't compress the air within it. This is why you'll never see a big box with 2 10s in it the way you do with 12's.
So while you do lose frequency at 8, you also lose pressure, and it will take a good box for it to sound near the size of a 10".
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I agree with what you said in general, except two 12's often have more total cone area than one 15. And sometimes changing the mechanical parameters of smaller woofers can make them require a larger box for flat response, but they are not usually designed that way.
Either way, there is more to it than just cone area, the woofer(s) should be designed for the particular box volume you are using.