i would think that the 4 12's would be heard further right? But a kid that seems to know his **** at my school says that i'd be wasting my money on the 12's, and should just get the 15's because it'll be heard from about the same distance. And if i got 12's i probably wouldn't have to get 6x9's or 6.5''s because the guy said the 15's would drown out the mids and highs, and the 12's were good for all around or something like that. But the 15's would be like 1400, and the 12's would be 1650...is it worth the extra 250??