Originally Posted by Red Five
For a ported box you can change the shape of the box, net internal volume, port area and port length need to be close to equal, there is a little wiggle room. MDF and 2x4"s are both good for bracing, 2x4"s are a bit overkill for some scenarios. The goal is bracing to be no further than 10"s from a corner or neighboring brace on the same panel. MDF window frames will work well with this design. A 1.5" width for the MDF bracing should be plenty. The biggest concern is the sub having enough depth for mounting. An inch clearance should be enough.
I left about 1.5inch space from the back to the driver to the cabinet just for some wiggle room.
to be honest i'm not sure at all on how to brace it, with window frames are you reffering to something like this?
when you mention a " A 1.5" width for the MDF bracing should be plenty" what do you actually mean, I'm sorry but I'm only just learning about DIY speakers.
Also with the bracing do you factor the volume lost due to bracing and increase the size cabinet a bit?