I am currently building the Audax Center channel. The plans call for two 5"long 2"id ports with streight cut ends. I want to use a 1/2" roundover on the exit and a 1/4" on the entrance. Do I keep the total length 5" including the rounded sections? Or do I use 5" plus the roundovers (total of 5.75")? Or something in between? Thanks for any input you can give me, I am hoping to glue it up tonight or tomorrow, I will post pics when I am finished of course.