The Helmholtz resonator consists of a cabinet and a tube (marked red on the
left). It's being used:
a) to suppress room resonance. To achieve this the Helmholtz absorber has
to be built like shown on the left.
b) to suppress cabinet resonance. Therefore, the absorber has to be put into
the cabinet (like e.g. K+T Flatline or Phoenix as in Hobby HiFi 1/2003.
c) as a bass reflex tube to achieve a lower resonance compared with the cabinet
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