Now have approx. 90 hrs. on my Sx Balanced cables and they started to flesh out after only 15 hrs! Now as I continue the sound is bigger, wider and deeper that any previous cable I have had in my system. RC Audio was my former reference with a large and deep presentation but now, using Grover's Silver Ribbons (speaker cables) and his balanced Sx IC there is more than just a subjective difference in the way my rig sounds now it just plain sounds even better and just continues to improve each time I listen to it. I also am in total agreement with everyone that has also posted, truely one of the most cost effective upgrades I could have done and (IMHO) an astounding difference and it took something special to replace my former reference cables as well. I hope Grover never stops.