Sounds to me like the problem is the amp/pre-amp combo. From my experience, Krell and Threshold components are very bright and "in your face." Mated with the B&Ws, I can see where your ears would be ringing, despite use of the Cardas Cross. Of course, you may have "room" issues, but in my experience such concerns are ususally not THE critical factor.
I'd get rid of the amp/preamp and start over. I have N804s and use a Musical Fidelity A3cr preamp/Musical Fidelity A300cr power amp (225 wpc). The MF stuff is extremely neutral and the choke regulation feature virtually eliminates all grain/distortion. There is simply no fatigue when listening to my system.
The B&Ws are EXTREMELY system dependent and I think you're missing the right synergy. When mated with the right components, the Matrix 802s can really sing, so I think it'd be a waste of great speakers to change. Your front end and cables look good.
I'd get rid of the amp/preamp and start over. I have N804s and use a Musical Fidelity A3cr preamp/Musical Fidelity A300cr power amp (225 wpc). The MF stuff is extremely neutral and the choke regulation feature virtually eliminates all grain/distortion. There is simply no fatigue when listening to my system.
The B&Ws are EXTREMELY system dependent and I think you're missing the right synergy. When mated with the right components, the Matrix 802s can really sing, so I think it'd be a waste of great speakers to change. Your front end and cables look good.