If you can't laugh at yourself....
Sorry, I know there's a language barriar and it makes seemingly simple questions difficult to answer at times. I was literally thinking of the cone, the concave part of the midrange. It was difficult to understand how it could be producing sound, yet not making any slight vibration at all. A midrange could have a buzzing sensation when touching it for example. But since you were refering the the phase plug we were literally on two different thought processes.
I apologize if I offended you.