tuning box

I’m picking up an awesome package here soon of great old Rockford equipment. I will be building a center console for my truck. The dimensions I’m working with are 36x20x16 but this sub box can be any dimensions within those parameters. I’m looking for 1.75 cuft of air for a single 12 tunes to...

So I'm taking my sealed sub box and turning it ported for my 2 12" alpine type r's both having 1.53 cubic feet already put a 2" port in tuned to 38 hrtz but I'm getting this weird flapping sound from them it's not the subs so I suspect it's the ports would it benefit me and will it maybe fix the...