The shape of the head is the key factor determining the stick sound on the drumheads - and even more so on the cymbals.
Heads
- drop - rich dark tones with emphasis depths
- barrel - good punch, good presence. Well suited for louder situations
- ball - clear, well defined Ping
- acorn - full, thomann fat sound. Very playable
- oval - broad midrange, similar to drop
All these shapes come under 3 geometrical main groups:
Round, oval, triangle shape. thomann The smaller the point of contact
between instrument and head , the higher the produced frequency. The
same applies to the density. The harder the material , the more “ping”.
This is particularly true for nylon heads. Not only are they extremely
durable but also deliver a clear, thomann well defined sound on the
cymbals. For many styles however this can be almost too cold a tone. And this is how it works in detail: 
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The triangular head |
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Here we have a very small
point of contact. It produces high frequencies and a clear, well defined
sound. Since the whole strength is concentrated on one point, the wear
is quite high. This can thomann be counteracted by use of harder wood,
nylon or carbon.
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If you change the angle of play, you thereby get greater contact. The sound becomes broader and softer. 
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The round head |
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The round headed stick
always has the same area of contact, independent of the playing angle.
The sound is always clearly defined. 
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The oval head |  |
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The oval head has a higher contact area than the round, but less than the triangular in a flat playing angle. The sound is warmer than round and triangular, however better defined than the triangular head in the flat angle.
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