  We show that the hybrid resonances of a DMR backed by a cavity are
meta-resonances, in that they can be made as perfect as possible by fine tuning
the structural parameters but without the requirements of extreme materials
properties, such as zero dissipation. Instead, dissipation in the DMR is
essential for the realization of perfect meta-resonances. We experimentally
demonstrate such perfection by tuning the structure of a HMR till its
reflection is as low as 0.426 % . Besides the primary meta-resonances that are
originated from the strong resonances of the DMR, weak hitchhiker resonances
can also produce meta-resonances as perfect as the primary ones. The depth of
the reflection dips is insensitive to the strength of the resonances involved,
but critically depends on the degree of impedance match to air brought mostly
by fine tuning the structure parameters, such as the cavity volume, the mass of
the platelet, or the pre-tension in the membrane. Using the eccentricity of the
platelet position in the DMR, a number of resonances and anti-resonances are
generated, resulting in up to five meta-resonances within the range of 200 Hz
to 1000 Hz, with the highest reflection being 7 % and the lowest being 1.2 % .
Other means of introducing hitchhiker meta-resonances are also reported.
