Yes you usually change the thickness of the loading wall, height of the port or width of port just like any other enclosure to adjust the tuning.Yes this is correct genius...And quit neggin all my post your just making yourself look like a little bitch!!Mike, please stop accusing people of "negging" your posts. Do you specifically know JayCee is doing it? Nobody pays attention to reputation points and even spam accounts can click the negative buttons. Uhh yea..Every time he logs on i get but rapped..lol..Guess you must be hitting him from the behind Seeing as you continue to have a problem with respecting others, have a fun vacation.