At the 72 hour mark, I tried cranking the system a bit. I put on The Dead Can Dance/Spiritchaser cd and listened to "Song Of The Stars". This was a MFSL SACD. The sound was better than I heard with my Groneberg Quattro Reference speaker cables. The bass was deeper and the highs were crisp but not overdone. When I checked the SPL meter (Radio Shack), I found I was pushing 98db SPL's. That is way too loud for me but it showed there was no sense of strain coming from the speakers. My Mac amp was showing 30-60 watts average (60w were the peaks). I am pretty impressed right now but it still could change. If this works out, I will buy a longer pair of these cables for my main system, probably a 25 foot pair. I will break them in on the secondary system because I can run that system 24/7 at a decent volume as its on the second floor of our home. Stay tuned, I will keep updating this.