Actually, I had a chance to do a side by side comparison a couple of years ago. I had gotten two identical lengths of brand new Kimber 4TC speaker wire. I was going to bi-wire my speakers. I wanted to make sure the wire sounded all the same so I listened to each run in mono, single wired. No differences. Then I listened in stereo, single wired. Again no differnece between pairs. Well, I was going away for vacation for 10 days and decided to put one pair on my old Duo-Tech cable enhancer. The other pair was left connected to the speakers. I came back, listened to the system for a while and then changed out the "green" 4TC for the "aged" 4TC. Oh my...what a difference! Immediate and obvious improvements in smoothness, dynamics and soundstage. I went back and forth several times to make sure and even bi-wired in mono. Yep, the differences were still there and still obvious. This was one of the most dramatic demonstrations of "burn in" I've encountered.
