Im building a box for 2 12' bm's and have a couple questions:
1. is a 4 inch opening good enough for 2 12's
2. Re enclosure calculator is :
port 4 inch opening.
The box volume came out to be 4.225 tuned to 31.15 Hz
But when I do a similar box to these specs in WINISD and BassBox Pro is telling me that the port is to small or too short. So the question is how accurate is the free re enclosure calculator compare to these programs.