I did a post on this a few months ago.. Should be on here somewhere. Basically, I compared the impact of 40' of starquad to no star quad.
I was surprised that I couldn't really measure an obvious difference in the amplitude or frequency of test tones. I think I ran some music through them too. Keep in mind that star quad conductors are much heavier than the typical 3.5mm extension cable (though 'heavier' can cause other problems).
So, I don't really worry about extending to my 4061's using SQ. You also mentioned splitters.. Those are a different beast..