Instead of dampening, edge treatment tweaks the overtones and response.
EC Reversed Dot snare heads come with a unique "reversed dot" made with the same 3mil material as the ring. Each head consists of a 7mil top ply and 10mil bottom ply for maximum durability, especially with the reversed dot version (which totals 20mils thick at its center). This features the sophisticated edge control system that banishes unwanted overtones.
A translucent frosted coating lends a unique, attractive look. Despite the head's relative thickness, it has a forgiving feel; ghost notes project tremendously well; rim shots offer a "tweaked" palette of rich overtones; and center-of-the-head strokes yield fat, focused tones. The stress-relieved reversed dot patch has the unique effect of eliminating some mid-range frequencies, yielding a desirable crack in all tuning ranges.
For snare drums it's particularly effective and yields a pre-EQ'd sound that will please both player and sound engineer.