Hopefully in the future I will be able to experience some new comps just to get a better idea of how the SR6500's compare (they are my first set of components.) But they seem to have a pretty decent kick, they are not shaking my rear view or anything but to me they sound good and I don't have the doors deadened or sealed up yet.
I also still have a lot of tuning to go but I believe currently I have them down low at 63hz with 18db slope (no subs installed yet) then up top I think they are at 4khz with 18bd slope and the tweeters at 3.2khz with 18db slope. This sounded a bit better to me than what I had before with them both crossed at 4khz and 18db slope. I am powering mine from a Sundown Sax100.4 and at times I would like a little more volume but I think subs and some good deadening will help with that, as well as spending some more time tuning and tweaking everything.
Of all the stuff I have read on the SR6500's it always seemed that they were very smooth but no the loudest and generally laid back, this is the closest thing to a negative comment I have seen on them.