@125x4, first thing that comes to mind for cheap and loud is the kicker ds series, and used. i've had the ds650's, and didn't hate them. traded them off, but still, bought them new, and that's not too common for me..... as for the title question- well both and eq, and cross-over will modify the signal it is given. so, if you run it through a cross-over, say a 80hz-down@12dbslope, well then that is what the eq has to work with, so you can "eq" that signal, and add, another 12db/oct. to amke it 24db/oct (just a sharper drop in sound level starting at that frequency) or you can use it (if it is set-up with that fine of tuning) to tweak high and low points in that range. and visa-versa.... say it's eq first, well you can tweak the full range all you want, but if you send it through a cross-over, then the outputs, are still going to cut and/or separate the signal that is given. it's simple as a "series effect" the second component will effect what comes from the first, and the first component will effect what comes from the source signal