General
Large core sizes increase power and
depth. Use large cores when you want maximum power
and tone on large timpani. Higher head tensions
generally need a larger core and/or more felt than lower
head tensions.
Some types of timpani
produce a less focused sound than others and may need
smaller cores and/or less felt than other types to give
good projection.
Natural skin timpani
heads generally need a smaller core and slightly more
felt than plastic heads.
Very slack heads and low
notes are generally better with cork or hard-felt cores.
Clarity
of sound and the acoustic qualities of your concert
venue
The exact degree of clarity that your
audience hears will be affected by many factors
including your timpani and heads, but most significantly
by the sticks you use and the acoustics of your concert
venue.
Very resonant acoustics
such as cathedrals can make the timpani very indistinct
with a very heavy bass quality to the sound. This
type of acoustic needs a more sharply focused, less full
sound than usual. You can achieve this by using
smaller cores and thinner felt than usual. The
smaller cores will produce less fullness and depth from
your timpani and the thinner felt will give a clearer
and more articulate sound.
Concert halls with very
dry acoustics need the opposite treatment and you may
wish to select larger cores to maximise the depth of
tone and resonance produced by the timpani and use
thicker felt to reduce the articulation heard by the
audience.
When playing in smaller
halls or with a small group of players, you may wish to
reduce the fullness of sound by choosing smaller than
normal cores so that the timpani are not overpowering.
The
perceived hardness of the sticks
The size of the core can affect the perceived
hardness of the sound. For example a 310
stick (small core) will sound harder and more brittle
than the larger 610, even though they
both use the same 1mm depth of felt. This is
because the 600 core produces more tone
and depth than the 300 core and this
bigger, fuller more rounded tone is perceived as less
hard than the sound of the 300 core.
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