by Rhythm House Drums » Thu Nov 10, 2011 3:12 pm
This is a tricky question and does depend a lot on personal preference and the particular skin. Personally I like a thick consistent-thickness skin. These can be hard to find because the thicker and larger the skin unusually the more pronounced the spine is. I've had the best luck on getting these from Mali... and generally stay away from the Ivory Coast skins as I've noticed they tend to have really thick spines.
I usually opt for near center of the back, and will bump it closer to the neck if the butt thins out, or bump it closer to the butt if the spine is super thick near the neck.
I had a djembe headed with an extremely thick spine for over a year. It was a nice thick skin so I could hold a lot of tension. The spine always played higher pitched than the sides, which made for interesting experimental solos.. though I never played the sides while in class or performance. One thing to note is that if you skin is making different sounds along the rim, it will have longer sustain. You can cut out some sustain by cranking it super tight. I now have that djembe headed with a more consistent skin and absolutely love the sound. It's got a much more pure sound without lingering overtones or oddities that can happen with different pitches on the same skin.
Another Issue I've had with thicker spines (or heading near the neck) is that I would tend to pull the verts tighter on the sides to try and get a more even pitch around the djembe head. This almost always ended in a skin failure due to the uneven tension in trying to obtain an even pitch.
I like a drum that plays tight and quick... for this you want a thick skin that is as consistent as possible, which usually means stay away from the neck area.
I've been experimenting around with the bearing edge shape a lot recently and have found some interesting facts that will effect sustain much more so than skin thickness or consistency... So, before you worry about what part of the skin you choose, I'd make sure that bearing edge is level and has a nice round-over that almost flattens out near the inner edge.