I have Studio 20 speakers and used to have some problems with the Ss. Recently, I bit the bullet and made 2 pairs of Chris VH CAT-5 cables and the Ssshhh problem disappeared. Very happy with the result.
As owner of a pair of Paradigm Eclipses my pic for speaker cable was the Kimber 8TC and have no complaints so far . My upgrades that have made the most difference was a Mark Levinson No. 37 transport with a Lexicon DC-1 as a DAC . The Levinson really made a huge upgrade in sound but did notice a slight harshness to the vocals and at first contributed it to the older 20 bit DAC in the Lexicon and then I had the idea to try some of the different interconnects I had around to the L + R preamp to amp connection . Anyway when I moved my Kimber KCAG cables to the L + R connections the WOW factor finally came into play! So now am trying a Kimber Select 1030 pair with KCAG going to the center channel and one of the rear speakers and the KCAG made the vocals smoother than before for the center channel.
The KS-1030s are not broken in yet but are sounding very good so far . The clarity and detail are just AWESOME with the Kimber interconnects so I suggest if you really want to make an improvement to your system try the KCAG interconnect !!