This coreflute material is interesting as you are also vibrating air inside the 'tubes' and air is exactly what we need to vibrate so that we can hear anything.
The word flute in that term now starts to make sense
You could, out of curiosity, put duct tape over the 'flutes' on one panel and do a left <> right direct comparison to find out(in the name of science) if that makes a difference.
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