I have a 230L sealed tempest. I want to convert this to ported, similar to the adire alignment. However, I need to know how to approach this. First question is, is the 230L LowQ model volume before or after driver displacement? I also have the amp built into the side, so i'm guessing that will take like 3L of air?? I need to know the net volume so I can tune it to 15.4hz. I can't use the adire alignment port length because that box is just a bit smaller, and after some calculations it loox like i might need to make the port either shorter or longer. I already drilled holes for the ports, I just need to install them. Much help will be appreciated.