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Hi All,
I think that what we have here is re-inforcement
at certain frequencies due to the proximity of reflecting surfaces at critical
distances(similar to "eigentones produced in a room by the walls) The
example given by ON6UX where a tube/Jar is used to enhance signals is most
probably a " Helmholtz" resonator (I think thats the name) which can
be used to produce a resonance with quite a high Q.
The technique is used in Hi Fi systems in
bass reflex loudspeakers,and details can be found in Hi Fi books,also in Physics
text books in the sound sections.Could be very intresting to try an
experiment.734s Laurie.
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