"John Phillips" wrote in message
...

"Slam" is an effect I have never actually felt in the concert hall
even
with big bass percussion so it may only be an artificial effect
which
occurs in "small" listening rooms. It happens in mine on all kinds
of music. Perhaps it is an effect which gets created at large rock
concerts but I only listen to rock at home.

Sit on the floor in front of a kick drum when someone kicks it hard...
That's slam :-) You can get the same kick drum effect just in front
of a loud PA at a gig