how new is your equipment ? is it fully broken in ( at least 6 months).
also, is your speaker placement correct ?( down to 1/16 of a inch).
do you have challenging room that is not symetrical for the speaker ?
your speakers are meant for near field listening with toe-in. they are very sensitive about this. your listening position (ears) from the speaker should be the same. ie the distance from the right tweeter to your right ear should as the left tweeter to your left ear. you have to sit realtivly close to your speakers, they are designed for this. it is a little weird, but once you hear it- you will know. it is like looking into the recording through a window, and when sit down it snaps into focus and when you standup it is lost. if you dont have that- then you need to concentrate on that before you audition interconnects.
in your current setup, do the speakers totally disappear and you have image height, width, and depth ?
if you have answered yes to the the fully broken in and the speakers totally disappearing and you have them setup correctly - and you dont have a challenging room........then you should hear a major difference when you change interconnects.
ALSO, make sure you are listening to interconnects that are fully broken in ( this is of major importance !!!!)
if you need help with your setup then find then a really experienced audiophile who can help you tweek your setup and your room ( someone who has the same speaker in the same type room- you can also contact the manufacture- they have written alot of articles on speaker placement with their models
in regard to ic's most interconnects fall in the 2 camps:
1. warm / bloom / body ( ie. cardas )
2. fast/ imaging / revealing (ie. xlo)
despite many different opinions- there is connection between price and performance .
i like the xlo signiture II interconnect it is very synergistic in my system. the cardas is really laid back and slower and doesnt image as well.
i would suggest borrowing a set of cardas from the shop ( try the golden cross) and see if you notice a differnce in your system. you may like the sound or you may not. if you can also take home a pair of wireworld eclipse or silver eclipse ( or xlo signiture) to do your own side by side comparison to hear what a "slow" cable sounds like compared to a "fast" cable
if you dont hear a differnce then something is REALLY wrong with your setup.
hope that helps!!!