Important Question for Shannon

[Dzemoo]

Its a question for shanon but if you think you can answer it then do so, i doubt it since you are a less experienced sub user than me but why is it that masked played on different players and different headpohnes have different effects, atleast in resistence and mood, why is it that different, speakers different eq settings produce different effects with the same sub on ultrasonic, and how do i know on which the sub is working best