Finally had the 7s installed yesterday. Johnny and Carlos from Audio Connections spent close to 4 hours here after driving 2 hours from the store. They do this with such care and intensity. They weren't leaving until they sounded like they should.
They moved the speakers to a couple different positions and alignments and then finally did the low frequency tuning. We played a copy of the master protection reel of Who's Next during much of the process.
My early impressions (I had a pair of 5As) are that there is a level of detail and delicacy in the mid range which is far superior to the 5A. I never owned a pair of 5A Carbons. The high end is also much sweeter. No graininess at all.
More impressions to follow in a couple weeks.