I've got some extra wood and 4in pvc pipe laying around that I plan on throwing together for 2 MTX 7500 12s that I got real cheap on craigslist.
My question is should I use 2 or 3 port tubes? They have an xmax of 16.5 and sd is about 522cm^2 iirc. The box will be about 4-4.25 tuned around 38hz. I'm just trying to make something that will sound good so I can resell it quickly.
The vent match for 2 is .03 and the vent match is .01 for 3 in win-isd. I don't really understand the vent match, just that it has to do with port noise. All help is greatly appreciated.