I have to say I think they did something wrong then in their testing of detectability? On a club/concert setup, or even plenty of subwoofers, you can very much

I have to say I think they did something wrong then in their testing of detectability? On a club/concert setup, or even plenty of subwoofers, you can very much feel the 20-40hz range that they are adding/removing in figure C. Something seems off here.