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Old 11th June 2020
Lives for gear

What you're seeing are most likely slat or binary amplitude diffusers rather than Helmholtz absorbers.

DIY Binary Amplitude Diffuser anyone?

If a truly sealed system as required for Helmholtz, and without dividers between the various sections, the peak of absorption would be an average of all the individual slat/slot combinations, which rather defeats the purpose of using this method to target specific frequencies.