Are cardboard enclosures any good?

it exists with wood as a sandwich layer

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tested cardboard with added layer of cardboard glued together with silicone forming a type of constrained layer damping construction.

Knocking test sounds pretty well damping for such a quick and dirty attempt.

Will make a test with a cardboard box constructed like this for a listening test.

Cardboard alone is not promising but maybe you can get acceptable results with this built.