I have 2 projects that I have just started on and a L5 15 in the back of a 97 eclipse is one of them. The L5 is going to be fed 600 wrms and I would like to put it in a vented box. I am probably only going to have about 3.5 cubes after displacment, So the question is what would be a safe port area and tunning freq for this sub + 3.5ish cubes + 600wrms. I understand that if you put a sub in a vented box the wattage is limited to the box specs and I do not want to get to close to the limitations because this person whom it is for is a volume master and will destroy the speaker faster. I might be able to get more volume if needed by doing a big fiberglass project, or would i be better off building a nice sealed box?