port help?

[67bass71]

I'm designing a center ported box but there will have to be bends in it as of right now the inner port dimensions are 3 high by 7.75 wide. When I get to the back of the box where the turn has to be do you half the port height to make it 1.5 at the back and go both left and right and do you half the remaining length and go wither way?? Any help is appreciated

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[67bass71]

Or would you half 7.75? And go left and right

 

[67bass71]

Bump would you need a diffuser?

 

[PSturmer 10+ year member]

half the port width when you split it. port length is measured along center of port