I'm building a bass box, as in for a bass player, using the JBL Professional Enclosure Guide as my design guide. I'm using the 10th referance, for a pair of 2225 woofs. Now I have 5 sides of the box built and went to fabricate the baffle board. After drawing the cutouts for the 2225s on the baffle board, I looked at where the four 4" port locations would go and had to pause. I felt that cutting the ports in on the front would weaken the baffle board. Is it acceptable to cut them into the rear of the cabinet? I've seen lesser makes do this, just wondered if this was an acceptable practice.