Keith, did you try the Valhalla or just the Quattro Fil? To my ear the Quattro Fil is very sterile sounding compared to the Silver Ref. I did an experiment in my recording studio and recorded the same music through each cable, and then played back the results. It was startling how much more ambient detail and even reverb was available through the Silver Ref that the Quattro Fil could not pass. I am using BAT VK150se amps, Wadia 860x CD and Dunlavy 4 speakers all plugged into a Sound Application CF-X with Krakatoa power cords and Satori speaker cable.