I believe Max Townshend addressed the perceived bass change. He measured it at a .00 something change in db's. I am getting a pair and will report out on my observations since I have a carpeted suspended wood floor situation. Another friend is using another type of isolation with a suspended wood floor and I think there is a perception of less bass but it's really eliminating the drum effect of the floor and the bass tightened up and added clairity to space to the soundstage. We shall see.