Box design

[just_like_u 10+ year member]

Im hoping someone can design a box for me. I have no clue how to use the box calculating apps. im in need of a box that is 7 cubed feet. I would prefer it to be 18 inches tall and 42 inches long and the width keep it under 23 inches. I want a big single port in the middle of the subs and both subs sharing the single chamber also. I listen to all rap and hip hop and would like to keep this tuned around 33-38hz. the subs are two 15 inch power bass extremes xs and are powered by 2400D Brutus amp running 2 ohms. I would like both subs and port facing back or up but both in the same direction. I will pay for a great box design with cutouts and what not. im open to all opinions good or bad

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[Immacomputer 10+ year member]

With those max dimensions, it won't really be possible to squeeze out 7 cubes without really cutting back the port area and putting the port in the middle kills even more airspace. I did come up with something that's 6.5 cubic feet after subs port and bracing displacement tuned around 33hz. I can send you the sketchup file so you can look at the box in real space. I also drew up a cut sheet. Message me your email to get some pictures and the sketchup file.