The way to keep that from happening, I wrote, is to use some kind of “divider” to keep the front and back waves apart the simplest kind of which would just be a huge board (an “infinite baffle”) with the driver mounted over a hole in its center so that the front wave would come out on one side of the board and the back wave would come out on the other. I also wrote that the most likely reasons for you not to be able to hear it are that: 1) Both sides of a driver’s diaphragm (the front and the back) produce sound 2) because movement that will produce a positive pressure ahead of the front of the diaphragm will always produce negative pressure behind it, the sounds from the two sides of the diaphragm are always 180° out of phase with each other 3) because the two out-of-phase sounds are produced at exactly the same amplitude (loudness) by exactly the same movement, the two sounds (pressure waves), if they ever come together, will cancel each other completely, leaving no bass energy left to hear. (Sort of like that tree falling in the forest). In previous parts of this continuing series, I wrote that, even if your speaker’s bass driver could make great deep bass, if you couldn’t hear it, that bass, for all practical purposes, wouldn’t exist.
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