the other week I played a gig where the previous band left a big 4 x 12 cab for me to stack my gear on, it meant that my top cab was literally at ear level, I've never heard such a clear trebly bass sound before, really easy to hear what I was playing, it was going through a FOH PA as well, so I wasn't concerned that it sounded that trebly out front.
At a gig at the weekend someone else used my rig, took the treble off and was using a Jazz bass (I use a P), to me it sounded horrible, all booming low end, again going through FOH PA, hope I didn't sound like that