I talked to Jürg (the owner, and founder of vovox) on the hi-endgear.com exebition in Germany about it.
he told me, that it's not necessary to buy the shielded version, as his cables usually dont have any troubles with outcoming magnetic waves.
if you have, you can buy the shielded version.
no sound-diffrence.
yes there is a sounddiffrence between cables.
cheers