Are cardboard enclosures any good?

[Freedom666]

it exists with wood as a sandwich layer

 

[Freedom666]

you can make a box with thin wooden walls and reinforce the panels with halved in height paper tubes glued closely together forming a matrix honeycomb alike

 

[cracked case]

Or you could use thin wooden walls and go mental with internal bracing - something like 50 bits of wood in each box, resulting in a light (1kg) but very stiff 8 litre enclosure.

 

[Freedom666]

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.

 

[Radian]

I did the same with pva glue with the second layer turned 90 degree.
Best result will be with very fine sand filled into the cavities. On the corners the pva glue will soak a little into the sand and thus create very hard corners.