I am using the Transparent USB $90 cable from my MAC Book Pro computer to my Ayre QB-9 USB DAC. My retailer is suggesting the Synergistic Research's Tesla Tricon USB $550 (WOW!!) cable but I do not believe a $550+ USB cable will make a significant difference over my Transparent USB cable. I have contacted others and the general opinion is you should try different USB cables and if you find something that sounds better then the Transparent and it is at a price you can justify, purchase it". My solution is to stop researching USB cables, enjoy my music and keep my Transparent USB cable.