What gives a system slam and dynamics?

[Infinitely Baffled]

IMO big drivers Low frequency you do not listen to it whit ears they hit U on tummy

I think this may be an example of what I meant when I said, upthread, that some appear to want to listen to music as if it were a collection of sound effects, rather than notes of varying duration and pitch. Of course, if the music you are listening to is in fact a collection of sound effects, then fine.
IB