I have a nad / wharfedale setup which I have been using this for more than an year now with 12 guage OFC speaker cable. I always found some recordings slightly muffled. Case in point is the Norah jones (come away with me cd) and diana krall (look into my eyes cd-the 1st song). I used to bypass the direct switch in my amp and increase the treble a bit to compensate for this.A friend of mine lend me a kimber 4pr cable yesterday to try with my system. What a difference ! It is like removing a curtain. The soundstage has opened up. The highs and mids are so much clearer and clean.
I NO LONGER USE THE TREBLE CONTROL.