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In the same way that a perforated panel absorber will still work without subdivided cells behind each opening, a 2D diffusor can still diffuse without well dividers. 2D is more forgiving than 1D in this aspect. However, a perf trap will be easier to calculate and perform to tighter tolerances with dividers, and one might say something similar for some 2D designs.
The design, sizes, and depths involved will influence how well they perform without dividers. The original omnifussors (with the recognizable QRD pattern) need the wells more than the newer skylines, and the newer ones like divider-less skylines, and also hemis and Berger's designs with dividers, diffuse more uniformly, especially in arrays of multiple units. So technically, the well-dividers are a required part of technology, but practically, for some combinations of element sizes and design, you really don't need them.
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