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I always found 10" to have a nice solid clean sound... Now I have always used sealed, 12" are nice more low end but I prefer 10" subs.. granted I have a 12" now doesn't change anything I just got it at a decent price.
No they're not. 15's are better. I think you will fond that ALOT of top SQ cars use 12's or larger. A few of the best cars that I heard at IASCA finals used twelves or bigger.