Wayne Parham Messages: 19014 Registered: January 2001
Illuminati (33rd Degree)
Sounds like it's going to be a cool build!
You can probably radius the edge of the ports without any ill-effects. There's a formula for calculating the Helmholtz frequency of ports with radiused ends that could be used to see. But then again, that port is huge - in a cabinet tuned and designed for full-range use rather than as a subwoofer. So you won't hear any chuffing no matter how hard you push 'em.