ok so the adbcwarehouse guy says its tuned to 30 hz and 2.5 cu ft.(this is for an fi q 12) Id like you smart box guys to confirm this please. here are the OUTER box specs of it. 27 inches wide, 14 inches tall, 16 inches front to back. the port is 1.5 inches wide(from the inside of it.. all open space) and approximately 12.4 inches tall(again open space.. i didnt count any woodon top of the port or below, if u know what i mean im bad at describing). The port goes 18 inches straight into the box.(theres no L, just an I) ok so id really appreciate what u guys can come up with thx a lot. o yea and its 3 quarter mdf wood.
The box you have looks like it's tuned to 32 hz instead of 30hz (if there is no L in the port like you said) and is about 2.43 cubic feet before displacement. So your looking at around 2.3 cubes @ 32hz for the box you have.
Did you tell the box builder what sub you were getting? And what power you would have?
You see, if you were using a low powered sub...say 2-300w, you would be fine w/ that much port area. But w/ higher power, you will likely get chuffing (aka port noise). I would go for at least 12sq per cuft for port area, depending on the amount of power you are using.
Well, technically yes it is the builder/designers fault for not building it w/ enough port area. But sadly, ALOT of shops don't know any better, and even when they do get port noise, they blame it on the sub not their box. Some don't even know what port noise is.
I would go talk to the guy and ask him if he thinks you will get port noise. If he looks like he has no clue what that is, mount the sub in the box and show him that 'chuffing' sounds like. Then tell him its because of too little port area, get him to rebuild it w/ more port area, but the same tuning.