It depends on what sort of environment the designer tuned the speakers for. The port tuning will be the designer's best guess as to what will work well given the speaker's anticipated environment. In the real world, low-frequency room acoustics varies enormously so the ideal tuning for a given application may be different from what the speaker left the factory with. Not many manufacturers offer user-adjustable tuning, but if you don't mind improvising you can adjust it anyway.
If you find there's too much bass close to the walls, either increase the port length or reduce the port diameter or both, thereby lowering the tuning frequency and hopefully transforming undesirable "boominess" into deeper extension. This can be accomplished with a section of PVC pipe wrapped with just enough electrical tape to give you a snug friction fit in the existing port (I've never actually done this but it's what I'd do in your situation). There is a chance that you'll introduce some port noise or bass compression at very high volume levels.
Once you've made a speaker choice, feel free to e-mail me with enclosure and port dimensions, and I'll do some calculating and offer a suggestion or two.
Duke
dealer/manufacturer
If you find there's too much bass close to the walls, either increase the port length or reduce the port diameter or both, thereby lowering the tuning frequency and hopefully transforming undesirable "boominess" into deeper extension. This can be accomplished with a section of PVC pipe wrapped with just enough electrical tape to give you a snug friction fit in the existing port (I've never actually done this but it's what I'd do in your situation). There is a chance that you'll introduce some port noise or bass compression at very high volume levels.
Once you've made a speaker choice, feel free to e-mail me with enclosure and port dimensions, and I'll do some calculating and offer a suggestion or two.
Duke
dealer/manufacturer