Yep, as noted earlier in this thread, I ran km184s>mp2 for awhile, just over a year I think. ran them >AD500e, >D100 (interim, after Apogee died), >SBM1, and into modSBM1. I really liked the sound overall, very good setup for the price at the time (which was before such innovations as the warm-mod UA5).
I always ran out of the 1/8" mini out, which had 10db less gain as I recall. Never used attenuators, never had a problem with clipping even at loud shows. The oft-quoted bloated low end of the mp2 (which I think people exaggerate about) was never really an issue running at absolute minimum gain out of the mini-out.
Enjoy your rig, I think you'll like it.
-Todd