Here's a question for everyone I have always had on this debate. I am not a firm believer in cables making a difference in the quality of the sound. Also note, I am not a prfessional installer but a guy who only does simple systems for family and friends and who gets paid in beer only. So, there are my qualifications, or lack of any.
If I look inside any of my audio and video gear, the wires in side are all 18-20 gauge max. Inside the speakers, the wire diameter is also small. So, can the interconnect cables do that much better? Only so much information can go into them from the source and the speaker wires can only accept so much as well.
Could it be compared to a water line. Supose you hade an interior house water pipe of 1" that fed to an outside house with a diameter of 12" and this was hooked up to a sprinkler head whose inlet piping was only 1". Would more water come out of the sprinkler head using a 12" hose verses a 1-2" hose?
Over simplification but this is something I've pondered before.
