So we have wood for a drum shell. Now how we use and position the wood in the shell plays a difference too. The drum shell is round so if you bend the wood against the grain to form the shell the fibres in the wood are under tension so they are tighter thus creating a higher frequency with more resonance. If you bend the wood with the grain to form the shell, the fibers are under less tension and so emit a lower, less resonant frequency. Many layers of wood oriented 90 degrees to each other is called ply wood. Today most acoustic drum kits have drum shells use this variety of wood construction. Manufacturers then use the characteristics of against the grain and with the grain in the layers to make the drum shell, thus creating any kind of sound they’re after. buku mimpi
Each type of wood used in the making of drums have their own sonic characteristics and they are used to created certain types of drum shell. As far as the type woods is concerned the 3 big types are Birch, Maple and Mahogany. Birch is very hard and rigid so this wood imparts higher tone with more resonance. Maple is very popular as it is a medium hardness wood and so imparts a very warm and even overall sound profile. Mahogany is a softer wood yet still non-porous so it has a deeper tone with sightly less resonance but good volume. The reason I mention nonporous is because porous woods have more air pockets and air does not transfer sound well within a substance. A good example of this are sound proofing tiles used in sound studios which are filled with air pockets. The more uniform the wood the better. Thus wood that is slow growing and denser will be less porous and be a good candidate for drum making. The porosity of the wood effects another factor I mentioned earlier and that is surface of the interior of the drum shell. More porous woods are harder to finish smoothly and rough surfaces do not reflect sound very well and so harder, easier to finish woods are used for the inside layer.