[mayhem13]

If it's possible, you don'y want to line up the port inlet with the rear of the driver-mechanical noise from the driver may resonate and be heard from the port at higher volumes. As far as bracing, i've been building my cabinets with biscuit jointery lately to reduce the internal bracing as much as possible. I would use a window cross brace every 8" withe port running through off center. When it gets close to the driver, do not use a hole in front of the port entrance on that first brace to deflect any mechanical driver noise. Wrapping the port in insulation is your call-whether it helps or not i don't know. I'm curious as to what freq your 1st port resonance is at-Could you use 2 4" ports ?