I've been experimenting with speaker rake angle/tilt over the past few months. In the past, I simply set my stands and speakers level with the floor, as is the typical recommendation in owner manuals. After many listening trials, I've concluded that this parameter can be just as critical as toe-in and wall distance. With my main system speakers, 1/4 of a degree can make a very audible difference, even in bass quality. I'm interested to hear of your experiences with this often neglected variable. Happy 4th!