I am running Walsh 5 Series 3 loudspeakers. The one thing I changed that finally tamed the upper octave like nothing else was switching to, get this, solid core .9999 silver wire, teflon insulated. I've always thought cable guys were kooks - but this cable does violin partials, cymbals and everything else above 10khz just right. I'm using a 12 foot run, which round trip (24') has a DC resistance of 0.12 Ohms (measured). Really, try it: you will be amazed ay how it eliminated high frequency hash.