Hello, I am working on a design for a vented Dayton DVC 12" enclosure that I plan on building over the holidays. I'm planning on a volume of around 4 cubic feet and a tuning frequency of about 22 hz. Using WinISD for modeling, it seems that using a single 4" x 14.22" port will generate excessive "port noise" (vent mach indicates .17). To correct this, I tried using two 3" x 17.1" ports instead, and the vent mach was acceptably reduced to .08. My question: Is there any disadvantage to using a pair of narrower, longer 3" ports rather than a single wider and shorter 4" port? I am worried since most of the DIY designs I look at seem to only use a single port. Does anyone with experience with the Dayton DVC have reccomendations for enclosure designs or know of any websites that have specifications for good designs for this woofer? Thank you for your time.