While not familiar with all your Components, the Audio Research Ref.6 is a serious bit of kit, the others while I havn't heard, have good rep's. IMO they are deserving of better XLR's than Canare. I was using Canare which does a reasonable job for a budget Cable. I upgraded to MS Audio Silver Litz, ok more expensive (not super expensive). The difference is staggering. Massive increase in Soundstage, Dimensionality, Resolution, Micro, Macro Dynamics, everything. Cullen Cable while not quite as good as MS Audio (a bit warmer) are pretty good for the $$$. I run 4 Mtr. from Pre's to Power amps or Active Speakers.
Long run balanced interconnects
I am looking at a situation that may require that I do a long run (25 feet) of balanced cable. Should I expect there to be a degradation on sound quality if the long run was between the phono amp and the preamp versus the preamp and the speakers? Any other advice regarding long runs of balanced cables?