The differing heights of protrusions on the acoustic Studiofoam Metro products serve to spread sonic energy out in the time domain, as well as each absorbing a slightly different slice of the frequency spectrum. You see, it takes slightly different amounts of time for sound waves to travel through the different sections of the Metro, strike the mounting surface and travel back through the Metro into the room, so wavefronts are in effect softened rather than just being absorbed.

This is why a 2" Studiofoam Metro room will retain a bit more “feel” than a room that’s treated with a stronger acoustic absorber like 3" or 4" Studiofoam Wedges or Pyramids and why, when coupled with a judicious amount of MetroFusors and Metro LENRDs, a well-controlled, natural-sounding acoustic space will result.