I put one 4 ohm in an MTX prefab box my friend had lying around.
I'd say it's about 12" high, 5" deep, and 24" wide. Maybe.
It has a round "port" at the top.
Hooked it up to my SAZ1500, turned the gain halfway up (not trying to give a technical review, just having fun), and all I can say is //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif x 12.
It sounded best when I taped the "port" shut. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
I wish, that would be a reason for not hearing it. I expected it to blow, but I only played it for about two minutes.
It barely made itself present, drowned out by my Kicker 6x9s (which are spliced off of my rear door speakers, so that'd be what, half of my HU output per channel?).
I hope that the box was just horrendously wrong for the sub.