hey all, i am looking to build a 4th order wall setup in my 88 suburban with 4 BTL UFO pie slug 18s, they will have xmax coils and rig is dedicated SPL/demo.

i would really love to find out what sealed size i need to base my wall off. since i want the bandwidth i am thinking 2:1 ratio. i have a calculated 100cf3 to work with so space is a plenty.. (50.25w x38t x91l) subs will be inverted (motor showing) all on the back wall, loading wall port will be drivers side. untill i find a sealed cf size per sub i really cant do a thing... ready to start buying lumber and resin

That'd be a fail. Scrap the idea that a "ratio" is ever a good idea

If you have that much space, just go with a flat wall or a clam, BTLs will not fail to put out. I love mine =)

7.5cu a woofer, 120sq of port per and you'll be a wind tunnel.

I would be scared to put a BTL in a sealed chamber.
I love those subs : they can be super loud, and still seriously musical and accurate.

It's a pitty they don't make N2's no more.

ok sounds like flat wall it is. 30cf and 480sq port. leaves me plenty of space for my amps and batts. i think more batteries are called for!

Make sure to take some pictures for the build log