Three 2" ports vs One 4" Port?
I've realized my ported 12 makes a noticeable amount of port noise around 20hz which is just around its tuning.
Currently it has a 4" port 20" long and flared at both ends. WinISD shows the 4" port at .12ms airspeed which is too high. Changing the port to three 2" ports around 15" gives me .05ms.
So, any reason the 3 ports won't fix the port noise issue? I've read about more surface to air resistance but I can't find any way of calculating how this will impact my design.