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Do I need to include a similar tube/opening at the top of the speakers that I'm replacing the case for?
Yes, if you want them to sound roughly the same you need to replicate the internal volume and the port geometry. You can change either or both to tune the frequency response.
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Yes.
If the original speakers had ports, the drivers will probably struggle with a sealed enclosure - not surprisingly, there are several other factors as well.
Back in the last century, if any of my students wanted to design speakers I used to make them read a book first:
https://books.google.co.uk/books/about/An_Introduction_to_Loudspeakers_and_Encl.html?id=HmNfAAAACAAJ&source=kp_book_description&redir_esc=y
Doubtless this newfangled interweb thing has the equivalent of clear explanations with pictures...
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Related question. Do I need to include a similar tube/opening at the top of the speakers that I'm replacing the case for?
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