internal box dimensions: 29.75Wx15.25Dx13H = 3.41 GROSS VOLUME
ok so i got two 10 inch cutouts with ONE slot port running in between them...i havent yet glued/screwed down the slot walls because i want to confirm a few things...first off...
1. when calculating length of port are you supposed to use the entire internal box volume not including what the port will be taking up
2. my length calculated for my (13" high. 3 inch wide port) is 21 inches...the internal depth of my box is 14.25. sooo if it goes 14 inches back and i branch out to each side....to i have to go out 7 inches on both sides....or 3.5 inches on each side (to get to 21)
heres a pic of my box