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All i want to do is stick to alpine and have a better stereo
Why quote me for and hit me with the banstick? This isn't the first time you have done this either.
If he's going to build and tune two ported enclosure's for 12'' drivers, then there's fk all difference worth even worrying about if the was to just use the 18 in a sealed enclosure as far as taking up space is concerned.
I try to give him a cheaper and simpler option.
Someone who is truly concerned about retaining some boot space wouldn't be fitting two 12'' drivers in the first place. The driver i reccomended is a good option, is well within the OP's budget, will sound much better than his original plan, and could even save him money.
two 12inch subs isn't "24'' cone surface area"
thats just dumb.
realistically the IXL 18's need much more box volume that two 12's would.
you could probably get away with the same volume, but only just.
but "2 x 12'' is 24'' cone surface area"
wtf?
I get what he's trying to say, even though it's not correct. HCVP: pi x r^2 = area of a circle
But seriously, two 12'' drivers each in ported enclosures your going to want around a 2.5 cu ft for each (give or take)