ANSWERS: 3
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That is the diameter of the speaker.
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10" for SPL - Sound Pressure Levels 12" for SQ - Sound Quality 10" subs require less enclosure space to reach there full potential, generally there a little bit cheaper, nad may require less power, they generally sound cleaner with tighter bass as compared to 12", they do not distort as badly at high volumes as 12" 12" subs have a heavier deeper bass with much better vibration in comparisson to the exact same sub, there not as clean as a 10" but if you'd rather feel the bass then hear it, then a 12" if for you.
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I am going out on a limb here and saying 2 inches.
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