Amazon.com: Evans EMAD System Pack, 22” (2pc) – Includes Batter Bass Drumhead and Resonant Drumhead -Externally Mounted Adjustable Damping System Allows Player to Adjust Attack and Focus Without Removing Drumhead : Everything Else
A Demonstration of the Evans EMAD Bass Batter Head - YouTube
EVANS G1 CLEAR TOM BATTER / RESONANT DRUM HEAD (SIZES 6" TO 20") – Drumazon
Evans EMAD Heavyweight Clear Batter Bass Drum Head 22 in. | eBay
EVANS HYDRAULIC BLACK 22" BASS DRUM BATTER HEAD | Reverb