I could use a little bit of help from the members.
I am using 3/4 inch mdf 19.05mm for the build.
Assuming 8L, I believe I would have to change the total box depth to 271.5mm. I would keep the height and width the same. This assumes the port and drivers take up no volume.
I cannot get the monacor ports in my area I settled for
https://www.solen.ca/en/products/solen-pt-2ex-50mm-adjustable-length-port-tube Speaker Cabinet Adjustable Port Tube 50mm x 160~280mm L (2"x6~11"). So this would be similar to the monacor 50. Internal diameter is 50 mm vs 51 mm. The initial port thickness is 2mm, and the part that goes on to extend length is 2.61mm wide.
When I crunch some numbers factoring in the port area for 53hz tuning. The box jumps up to 284.6mm in total depth. The Port seems only to need a 213mm length. Sub box pro/vs winISD
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WinIsd does not factor in the area the port takes up, correct? Or does it?
A quick workaround I am using is a sub-box pro
https://subbox.pro/en/
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I cut up MDF sheet for 10 speakers total using the original dimensions. I then re-read the thread and relized the port is small for its size. I was going to buy two smaller monacor ports, but they were sold out. I figured going with the bigger port allows me to save some time and hassle vs two.
Now im stuck with a lot of MDF, and the mbr 50 equivalent port. But no idea what to set the port length to because I'm not exactly sure how each software calculates it.
TLDR: What is the length of the port when using the MBR 50 without having to double or triple the rear panel to get the optimal tuning?