I like the shiva's too, in about 1" sealed they only need 2-300 watts, get loud, sound great. Not sure how hard they are to come by.. I'll be selling mine in the next month or two...
i hope you meant 1', not 1" cuz if you can put a sub in a cubic inch box, I'll take one //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif