Hello Sir, I have this blaupunkt velocity sub-woofer with me and I like to build my enclosure for the same. I am looking for a vented enclosure for a tight and deep base effect for my 3 box car. I dont prefer to have a round vent as I cannot procure the same here request you to give me the right dimensions for the vented enclosure with a rectangular port. Moderated By: brian@diysubwoofers.org