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Titanium
is used because its exceptional stiffness to density
ratio allows the dome to be made just one thousandth
of an inch thick. The shape of the dome itself is designed
so that the first break-up mode (where the dome begins
to flex) is above 20khz. This ensures that the unit's
behaviour is tightly controlled throughout the working
bandwidth, resulting in very low distortion, flat frequency
response and smooth acoustic dispersion.
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