First you need to differentiate...are you dead set on "3 12's" or do you just want something that sounds good? I ask, because alot of people come in here with the notion that they need a certain number of subs or a certain size in order to be loud....because that's what their "boyz" said. Point is, you can put together a system that uses less than "3 12's" and be as loud if not louder if you simply make better decisions on system design, budget, and efficient use of space available.
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I got a dig bick. You this read wrong. You read that wrong too.