Ashley James: A good plan is to ask wives or girlfriends because their hearing tends to be more sensitive and they don't like hi fi anyway, so often notice something when we don't. We never ever trust our own judgement, we do numerous A/B tests and we've a collection of "golden eared" friends and experts who we invite round to hear anything we need independently assessed. Ash
My wife appears to have these golden ears. I have blind tested her with music at different bit rates and she got all bar one right. With regards to burn in, I think that it is a combination of the product and the ear. I remember particularly with my Kimber speaker cable at first I noticed no great difference over the QED cable it replaced, though my wife stated it clearly sounded better to her. We then went away for a week or so, so the hifi was not touched. On returning I switched it on and both of us noticed a clear improvement in sound, both on how that cable had sounded at first and over the original QED cable. I would suggest that that is down to the cable as well as the ears.