Just got my designs for a 4th Order Bandpass last night for three 12in Type-R's.
The rear chamber is 4.3cubes before sub displacement. Not sure what the displacement is on the subs. The port is tuned to 56hz
I was kinda scared when I first got the plans because I thought the rear chamber would be to small for 3 type-R's at 4.3cubes, but 80inches says that this box will get pretty **** loud and hit the low notes pretty good so I'm pretty excited to start building it this weekend and to get some flex vids
Box will go in a '95 Explorer
but here is the box.