New XLR cables for system? Need your opinions

I'm trying to determine if new or different cables would bring something better or different to my system.

My system is: Krell 2250 amp, Krell 280p preamp and Classe CDP.5, all cabled with 8yr old Wireworld Equinox XLR's. Also have Audioquest Slate speaker cables for my Paradigm 60/v4's.

Thanks, Jim