Trev,
re-arrange the following.
Worms,
Can,
Of,.
put down the shovel, step away from the hole , is an appropriate phrase...
but.... as my last comment
Voids i mentioned...
I was talking about concrete surfaces.
For example, a High air content mix, as it sets, results in loads of tiny bubbles in the top surface, many of which will be partially open to the exterior , and possibly linked to others a little further inside the material, of a variety of depths....
the result is a floor surface that's , in essence, actually more like an Aero, or Whisper bar with it's top shaved off.
which displays a more complex mix of small scale absorption and smaller still VHF diffusive properties, than a material such as a high strength , low air, self levelling top screed mix, that's been polished.... and demonstrably sounds different....
or wood.
so to compound the disagreement here still further....
Concrete is not Just Concrete.
or rather, Not all concrete is created equal
as to the resonance component.
as well as the material itself, how a floor is built will determine how it behaves as a resonant structure... and this resonant behaviour has bearing on the actual absorption, reflection and transmission that happens as a result....
(Think about the differences between assorted wooden bodied instruments for 30 seconds, and then scale it up to room size)
and therefore also, the contribution back in to the room . and therefore the sound of the room.
so one COULD say that most of the tabled data available is arguably irrelevant, other than as a general indicator of inherent difference.... as very few of them specify with any great detail, exactly how the floor was built, and what portion of the behaviour might be ascribed to structural resonance patterns as opposed to purely material based behaviors...
anyhoooo.
the bottom line is that different materials DO sound different...
whether on floor , or wall, or ceiling.
or guitar.
,