I wouldn't use round ports or particularly follow the recc of JL sometimes they offer a smaller than perfect size to make it look more usable, don't get me wrong it would boom hard in a ported 2.5cuft for example but it may not be the PERFECT box for it in the same way my last box ~(with the subs in the seat) was built to Powerbass specs for a small ported enclosure but it can work in anything from 2cuft ported to 4cuft ported so a huge range of box size to be used.
Sorry Darren taken the thread over a bit I'll shout at myself lol.
JJ
Sorry Darren taken the thread over a bit I'll shout at myself lol.
JJ