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AdministratorSeptember 19, 2020 at 9:45 pm
To help with the two questions you have above.
Like @tvor-ceasar said, you typically will want about the port diameter away from the port wall. This simply means, if you are using a 1.5″ port you will want it to be at least 1.” away from the front baffle.
Your second question was what happens if you lengthen the port. This will give you a lower tuning frequency. However, that does not mean you will get more low end. You could be tuning the enclosure too low, which would actually lose bass performance. It also will affect cone excursion and rear port air velocity. That is one of the reasons using a program like WinISD is so important. It will allow you to see what would happen if you lengthen or shorten the port.