There really doesn't have to be much of a difference. That is dependent on your enclosure.what is the difference of a subwoofer of 8, 10, 12 or 15 inches in sound?
the ouput frequency of a sub is determined by the source unit, not the sub itself (different sized subs will "put out" the same frequency, just how well they will handle said frequencies depends on MANY more factors than just size of the sub)would affect the output frequency or of the notes
More cone area = more volume displaced, which COULD lead to more output, but not necessarily. Also, it helps sell the product because people think bigger is better.I am sorry.I speak little English
and why is there a difference in inches from the subwoofer?
if there enclosure were the same(according to each size of the woofer) and they were tuned the same they will play the same frequency's , but the bigger ones would just be a little louder (in theory to many factors come into play)8, 10, 12, 15 = they all are equal