smear is exactly the word one would use to describe intermodulation of the desired signal with an effect caused by movement of the entire speaker back & forth from the drivers (esp. bass) & is the reason people buy heavy stands or cones, etc.
Dick Vandersteen used to tell buyers to fill his stands with sand or lead shot for this reason
No idea if this brand is better than any other tho
quite possible that the power of suggestion in the video could cause a difference in perception by a listener - that is why we do blind testing
The real solution to this problem is a dipole radiator ...