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Could i just router the edges of the port with a rounded bit

Ok say i wanted to do flares do you guys have any ideas or meathods.

Ok thanks Guys And for flaring the ports i thought about it but i couldnt come up with any ideas i was planning on just using PVC Pipe, also flare on both ends or just exiting?

Thanks i was hoping to learn info like this. Should i then move the sub to the opposite side of the ports or keep it in the middle?

Hey guys this is my first post here but have been browsing for some time now. I have designed a box for 1 18 either the Sundown z .2 series 18 or the T3 T.2000 but thats for another time. My reason for posting is to get opinions on the box I designed. Im wondering if the ports will work like this? Also if this is ok woofer placement. Im going to be adding 45*s, dowel rod bracings, and maybe some fiberglassing. Im here to learn so if you see flaws please let me know so i can learn. Here are the dimensions Here are the sketchs I made in google sketch up. Be easy these are my first ones. This will be going in the trunk of a 2000 grand marquis and powered by either a 2200 or Hifonics brutus 2600