I never realized a standard 3.5mm interconnect cable would work with coaxial... interesting. I have a few that are decent sizes for when I do a X5/C5 combo, so when I finally get myself to break down and pick up the mojo, I'll give it a try.
Not seen anyone yet claim to have heard the difference on such a short length. Different if using a four foot cable from CD player to a HiFi amp.