[nicoff]

I do not think that there is a contradiction between 'Sounds great' and applying changes that are 100% technically correct. Applying technically correct changes can result in the same system sounding better than great.
As an example, my home theater sounded great. One day I decided to move the speakers around and ran a speaker frequency response for each speaker after repositioning. The recorded sweep noise showed a sharp drop in the high frecuencies of the center channel and in one of the surrounds. It turned out that both tweeters were damaged. Replacing the tweeters made the great sound even better. I have no idea how long those tweeters had been shot!