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From: Mike Curtis
Date: Sat, 30 Nov 1996 13:58:14 -0800 (PST)
Subject: Re: resonant beings?

On Sat, 30 Nov 1996 WVE~OL.COM wrote:

> In a message dated 96-11-30 04:00:35 EST, Mike writes:
>
> >It also may well be that physical dimensions have an effect, as other
> >resonator types come into play, e.g. tuned column, etc.
>
> I doubt it. A tuned column of air that resonates at middle C ( hole 1 blow)
> is as long as a flute. This would give a whole new meaning to the expression
> "deep throat".

But in combination with a cavity, a tuned column can be much shorter. A
prime example is the tuned port bass reflex enclosure, which uses a short
column (maybe 6 inches or thereabouts) in combination with a cavity (the
enclosure itself). I believe in this configuration, the "column" is being
used more as an acoustic capacitor to tune the cabinet to a lower
frequency while maintaining a desired port opening size, but the result is
the same. Do we consider it a box-loaded column, or a column-loaded box?

BTW, a popular home construction project back in the late 1960's was the
"Sewer pipe speaker", which used an 8" diameter x ~3' length piece of
sewer line as a tuned column. Because the base was partially closed,
resonance was lowered to the ~40 Hz required by the speaker. A 1/4
wavelengt~40 Hz is around 30 feet.


-- IronMan Mike Curtis
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