why stick to recomeneded?5 cubes? stick to recommended, if you don't have the space for it run a 12 or multiple 10's or something.
everyone will tell you a smaller sub in a proper enclosure will sound way better and get louder than a big sub in an enclosure thats too small.
why stick to recomeneded?
alpine recomened a 1.5" thick port for a 15",//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif
If we all followed the rules, we'd be trying l7's in sealed boxes.