I use XLR cabling between components and even for runs to my active speakers but I have no illusions - the sound quality is no better than RCA (to my hearing). As some have pointed out, there is indeed better noise rejection and less problems with ground loops/hiss .....especially when using long cable runs. These are very important factors to pros who have different equipment hooked up in their studio each day and cannot afford to waste time trying to trace a hum or ground loop.
In a modest home audio set up, RCA jacks can perform just as good as XLR....and they are cheaper to manufacture! (Although it is sometimes a sad reflection on audiophile equipment consumers that some extremely expensive equipment manufacturers should cut cost by not providing balanced circuits and XLR jacks whilst packaging their items with beautiful brushed metal and expensive finishes....form over function is what sells I guess)
In a modest home audio set up, RCA jacks can perform just as good as XLR....and they are cheaper to manufacture! (Although it is sometimes a sad reflection on audiophile equipment consumers that some extremely expensive equipment manufacturers should cut cost by not providing balanced circuits and XLR jacks whilst packaging their items with beautiful brushed metal and expensive finishes....form over function is what sells I guess)