You could try a constrained layer damping approach:
-----Slab--------- Thin viscoelastic layer -----Slab---------
I would probably avoid just a soft layer, as it will make the speakers unstable and in my experience often muddies the sound.
@danb started
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You could try a constrained layer damping approach:
-----Slab---------
Thin viscoelastic layer
-----Slab---------
I would probably avoid just a soft layer, as it will make the speakers unstable and in my experience often muddies the sound.