Can't really blame him, that is alot of money to put aside to prove a point.

Here is my theory.

The whole room is rotating on an axis. Simply secured the picture/chair in one place as the wall/picture/floor move to the side.

Also if you look closely every object stops by hitting the speakers dead on, such as gravity would pull it. Notice how they never have the object propel itself from a different angle toward the speakers. This is consistent with my whole set tilting on a single axis theory.

Assuming that this is a viral ad for a speaker company I'm sure they have the funding to do that.

Also, for when they pull back the camera if you look closely (not just ignoring the fact it's unplugged now) you can also see the set has ever so slightly changed when they black the screen to say "Gravity Speakers" such as, look at the orientation of the photo on the wall. It is not the same as it was before possibly showing the set has changed.