When you look at the graphs, of course there is a difference but then when there is a difference in crossover, how can anyone reliably show the meta really improved something. Can anyone point out the “issues” the old version had that can be solved with the meta material.
May be future references will have a stack of metas working well for low frequencies as well then, eliminating the need of a sponges. One thing I always felt good about such materials is how well the manufacturing process can be controlled. When we arrange the damping material inside the boxes, depending upon how you arrange it, the sound changes as per my diy experience. With these things, you don’t have to worry about if. your factory worker screws up something.