Nice setup you got there..always cool to talk a fellow B&Wer
I am just starting out with building my dream system.
I have a primariliy digital setup Krell Evolution 402 as the power amp, Lavry DA10 DAC and Airport Express as the purely digital transport from my Macbook Pro (which is bit accurate).
Speaker wires are Acoustic Zen double barrel and Radioshack 10awg copper cables. The only mod for the Radioshack cables is that I had the ends dipped in 22 carat gold to ensure they dont corrode at the binding posts and loose SQ due to the Copper Oxide formation.
The 800D are simply amazing using both the cables and I dont hear even tiniest bit of difference.
Now as I said the Acoustic Zen and my DAC are not state of the art and must be upgraded before I upgrade my cables
But as an electrical engineer all my learning tells me that the inductance and capacitance for just 8ft of speaker wires that carry high voltage and high currant the impact will be minimal. I might be wrong for the headphone cables though because the currents and voltages we deal there are lot smaller compared to the output of Power Amps that drive the B&W
I surely dont have golden ears nor as much audiophile experience, no elaborate sound walls in my rooms and I listen to music only in the digital domain so may be thats why I cant appreciate the cables.
At some time in the distant future I would "upgrade" to Wison Alexandria..but that is wayyyyy too distant. *sigh*