i have the x-530 and its not awesome. its pretty good. the bass is a bit boomy at high volume. it depends what you're used to, if you're used to regular speakers, then you'll like em. but i would like more bass. oh and sometimes you can actually hear hte air that comes out of the hole.. kinda annoying, hehe. but still, for the price, theyr'e great.
as for the z5500, 188watt just for the sub, should be nice.
"Is virtue a thing remote? I wish to be virtuous, and lo! Virtue is at hand." -Confucius