How bearing edges change a drums sound
Back in the home studio looking at the 7 piece Pearl Vision drum set I first tried using polyurethane and a metal flake for the finish; and I was thinking, I can redo the bearing edges to get a better sound. When talking to most drummers about drum kits or snares, the talk will usually go around the material, hardware, and make without really taking into account the kind of bearing edges the drums have.
Although the shell material influences the sound of a drum; the amount of contact that a drumhead makes with the shell will determine how much vibration / sound travels through the shell. More contact with the drumhead will dampen the sound of a drumhead and have more vibrations pass through the shell. This will have the shell resonate more and become more prominent in the overall sound of the drum. Sharper edges usually have less contact that will allow the drum head to resonate more and have less vibrations pass through the body of the drum.
A bearing edge consists of the inner edge (that is usually the larger angle) and the counter edge. The inner edge typically takes 50% – 80% of the shell itself while the counter edge is the smaller side that faces the shoulder of the drumhead. The closer the edge is to the center of the shell; the less contact the drum makes with the shoulder of the drumhead and, will have the drumhead resonate more openly. The most common bearing edge you will find on drums are 45 degree angles but, 30 degree angles and full roundover edges can help dial in the killer tone you may have never known you needed.