Way back in 1979 I was building a set of speakers that everyone seemed to like. They were made with Phillips Deforest drivers (no longer available) with a 12″ woofer, 2 x 4″ mids and 2 x 1″ tweets. I won’t say the sound is bragable by today’s standards but they did well enough.
But in that design I did something a little different. I used a multi-layer cabinet design consisting of a layer of 3/4″ MDF board sandwiched with 1/2″ plywood (on the outside) and isolated by a thin layer of silicone calking compound. The result was a virtually dead cabinet. No physical vibration at all.
More recently I came across this video … https://youtu.be/EEh01PX-q9I … that revisits the idea. (jump to 24:30 for the cabinet discussion)
Now I’m wondering if others have experimented with similar construction techniques and what the results were.