Thoughts for Future Speaker Designers

Putting the motors aside it is easy to see how the panels of a speaker act as " their own speaker" when back waves strike them. The discussion is also about composite vs single material for enclosure, and high mass vs low mass materials. Lots to consider. 

The noise cancelation would be very difficult due to all the variations in frequency and volume. The takeaway from this video is how much  the cabinets add energy to the listening room. He also points out that a composite with low mass material would be ideal if it would strong with low flex. So perhaps heavy massive speakers do as much harm as good in terms of dealing with rear waves/energy.