Reinforcements Hoops
If you
look inside the interior of a drum you may see that there is a second layer of
plies, maybe 2mm thick at the top and bottom 3/4" - 1"of the shell, These are usually angled to match the
bearing edge cut, with the central vertical area of the shell remaining at the
'proper' shell thickness. These are known as reinforcement rings. primarily
these are used for maintaining roundness and tune .
With the
on-going development of drums, manufacturers have created product lines that are
very thin-shelled to produce warm and woody sounding drums, although
structurally sound, these drums, particularly larger sizes, may distort with the
vibration of being struck, the reinforcement ring acts as a shock absorber and
keeps these excessive vibrations to an acceptable level.
Reinforcement hoops therefore, by restriction, counter the tonal
effect of thin shells to an extent, however as John Van Ness from DW drums says
in his article
on re-inforcing hoops on this site, they taper "off the highs because the column
of air is physically blocked by the re-inforcement hoops at the inside edges."
Certainly you should expect less resonance a more low frequencies from a drum
with reinforcement rings.
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