Have you herd that the B&W's are hard to drive?
The 603 doesn't appear to be especially difficult to drive (something like 90dB efficient and an 8 ohm load). The 601's a little less efficient, but it's also serving as a surround so isn't being challenged as severely.
One funny thig here is that while position of a volume knob isn't necessarily a reliable comparison, calibrating to a reference level
should be. For example - where was the Yamaha's volume control when you calibrated it? Along the same lines, what sorts of dB levels are you hitting when listening to a CD in that space with the 990's volume at 0dB?
Another odd thing is that you are running 10dB
louder on CD's, when DVD soundtracks are almost exactly that much
lower than CD's and cable or satellite broadcasts (even before the recent tendency for more and more CD's to be mixed "hot"). Typically, I'd expect to see DVD's running at the higher level because of this.
Like I stated the old Yamaha seemed like it had more punch. Not as clean by any means !! I did hear a huge difference in the clarity?
Am I right in taking this to mean that the 990/7125 combo was presenting greater clarity but without some of the Yammy's punch? Did you many any changes to the way you're handling bass management, like running the mains at a lower crossover point? I don't know that it would make a difference - just tossing out some thoughts.
I was thinking of going to the 7500 whats your thought?
I'd first talk to Outlaw a bit and make sure you can rule out any configuration issues. The 7500 is most definitely a beast of an amp (mine drives my Paradigms as far as I need without any strain), but it'd certainly be both cheaper and easier to stay with the 7125 if there's an easy fix...