-----Original Message----- From Corey Bailey: ".., I was able to detect a slight difference between a gold-layered CD-R and a silver layered one. The gold-layered CD-R sounded a bit harsher in the mid range to me than the silver layered samples. .." Before we get all mystical, it should be pointed out that on a lot of CD players the master crystal that clocks everything is located on the same chip that controls the motor. Any change in the amount of current being drawn such as how off-balance the disk is will change the temperature of that chip, and with it the speed of the master crystal. Any time we hear a very subtle change in sound but don't know what caused it, we'll generally read all manner of symptoms into it. Bob Olhsson Audio Mastery, Nashville TN Mastering, Audio for Picture, Mix Evaluation and Quality Control Over 40 years making people sound better than they ever imagined! 615.562.4346 http://www.bobolhsson.com http://audiomastery.com