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At a null point of a standing wave, there never was any energy. At the maximum, there is lots of energy. We are talking particle movement here, kinetic energy of particles. At the null point, there is no movement, ergo no energy, E = 1/2 mv²
But this kinetic energy is what we convert to heat in a porous absorber.
We can get a lot deeper into this discussion (I'm having fun, hope you are too) once I get back to my office tomorrow, where my acoustics and physics books reside.
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