HAVE CABLES EVER TAKEN YOUR SYSTEM FROM SOUNDING JUST OK TO SOUNDING GREAT? Experiences ?

calvinj, it sounds like a good way to go. I think for people that have very revealing systems will be more inclined to hear a big difference. A few years back I was testing a well-known highly reviewed amp. After careful listening I couldn't understand what the fuss was about until I changed out the interconnects. What a difference, it was if I spent thousands of dollars on a far more expensive amp.

@phd 
one of the customers who tried the Infigo audio usb and interconnects said it felt like he had a new component. The previous cables were a bottleneck. Sometimes the cables hold back your electronics.

Nope. Minor improvements with simple-designed tube amps that naturally have poor input and output impedances and are obviously affected by cable capacitance and inductance. With properly designed gear audio recording studio type XLR is sufficient.

Simple answer NO, need fairy dust !! 

Rick Shultz  Audio former High Fidelity Cables Made some really big improvements in my system.