I've done 18s before in 4.5/5 cubes and they work fine and meter louder then most of these installs you see with 18s in gigantic enclosures.
I'd rather have a small enclosure with less impedence rise and tune it lower instead of a stupidly big enclosure with impedence rise through the roof...that requires a gigantor port.
but to answer the question....12s will sound like a wet ***** fart in 4-5 cubes each...so you CAN build it...but it would sound horrible.
You can build a box for like 30 bucks man...don't be cheap!
why not build something like a t-line for the 12's that way the ENTIRE box is big enough. then when u switch to the 18's take out all the un-needed port walls from the t-line and change the baffle?
Well, I ordered 2 Sundown SAZ-3000s and am running 2 12's from one of them(my sig). Then I wanna run 2 18"s, custom sundown or Fi BTL, off both of them. I guess I could either fill the box or wood til the 18"s, or just build 2 boxes. Problem is I don't have any time! I guess I could have SPY build somethin for me...
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