box I have is 3.5 cubic feet, gross, minus port and speaker displacement.... The tuning is currently 45hz. I was told that this is right tuning for a box for my car, basically almost any "trunk" car like mine is what I think he meant. He said 36 and lower is way too low for a car like mine. Any thoughts or comments on this?
45 hz and higher is crap for SQ in my book. Honestly, for SQ I wouldn't recommend anything higher than 36 hz, of course depending on the sub. You'll need a subsonic filter with a 45 hz tune and will miss out on some music information b/c of the high tune and the SS filter required.