Could somebody clarify a pink noise frequency you using in a "ball of sound" test, please.
Also, what is your description of the "ball of sound" in the lay terms. I'm using 500 Hz test tone from Rives Audio test CD #2, and what I hear is a pretty strong center image with some depth to it, but I'm really having problem describing it as a "ball". Is it suppose to be round? Am I simply can't hear it, because my placement is off?, or it's something other than "a ball"?