Someone anonymously gave me a red "chicklet" for saying:
"And the subwoofer, if it is doing its job, is going to be able to vibrate everything in the room anyway, no matter where it is placed."
Their comment:
I guess someone expects a subwoofer to be wimpy and unable to cause vibrations in an ordinary house.
Mine are capable of vibrating the room when the volume of the system is turned up loud, even though they are placed on a tiled, concrete floor. Since they move air, and there is air throughout the room, they can vibrate anything in the room.