Might as well add some observations on cabinet material and such;
Almost any sorts of cabinet material and mechanical construction have been tried by different manufacturers through the years. Wood, chipboard, MDF, HDF, panzerholz!, plywood, plastic materials, concrete, metal - aluminum, sandwich laminates of combinations of those materials, and the ultimate - sand filled totally dead boxes.
All claim to be the ultimate solution to the seemingly unsolvable mystery of cabinet vibration and panel resonances.
If any of those were superior, would it not be so, that eventually all good speakers were made using that material? Instead, we continue to see all sorts of cabinets, and from what I can see, there is no good correlation between type of cabinet material and sound quality.
There is, however, a correlation between execution - how it is used, shape, thickness, physical cabinet design - and sound quality.
I have ended up choosing to make the cabinet reasonably dead and rigid, and free from any obvious resonances, and then believe there is little to be gained by further chasing the totally dead box. But of course, I can be wrong.
There are reasons why this approach makes sense - technical and measurable reasons. Because other properties of the cabinet easily end up obscuring what is left from resonances and emitted sound from the cabinet itself.