[TenTec] Re: 2 minor comments: Speakers and Centurion

Bwana Bob wb2vuf at qsl.net
Tue Aug 5 21:53:42 EDT 2003


I was able to make a substantial improvement in the sound quality of my 
Model 260 power supply/speaker by taping a plastic food container filled
with cotton onto the back of the speaker. It cut down the vibration and
resonances in the cabinet.


				73,

				Bob WB2VUF

Robert & Linda McGraw K4TAX wrote:
> 
> Just be sure the foam is OPEN CELL foam and not closed cell foam.  Closed
> cell makes good padding but won't hold water like a sponge.  Open cell will
> hold a good bit of water.
> 
> Fiberglass, the pink stuff, works also quite well and has been used for
> years.  Most speakers either have an open back, or if an enclosed cabinet
> then a slot in the front known as a port or a slot with a tube attached
> extending toward the back of the cabinet known as a tuned port.  All of this
> depends on the cabinet volume and the free air resonance of the speaker.
> 
> 73
> Bob, K4TAX
> 
> ----- Original Message -----
> From: "Rob Atkinson K5UJ" <k5uj at hotmail.com>
> To: <tentec at contesting.com>
> Cc: <k5uj at hotmail.com>; <kd7efq62 at hotmail.com>
> Sent: Friday, August 01, 2003 12:32 PM
> Subject: [TenTec] Re: 2 minor comments: Speakers and Centurion
> 
> > Hi Todd;
> >
> > The foam is speaker enclosure baffling material.  It's used to lengthen
> the
> > space the sound has to travel through without increasing the size of the
> > cabinet.   This is a method used in cabinet design and is often found in
> > stereo speakers.  Baffling flattens the frequency response of the unit and
> > boosts the bass response slightly.  If you have an old speaker in a
> cabinet
> > you can try buying some foam rubber at a hobby/crafts shop, cutting it to
> > fit across the inside of the cabinet and put it in behind the speaker and
> > hear the difference.  Large bass speakers with cones that move a lot will
> > need an air tube exiting from behind the speaker either through the
> baffling
> > or through the front to equalize the cabinet air pressure when the cone
> > moves suddenly.  I doubt if this kind of speaker is used in ham radio
> > however.
> >
> > 73,
> >
> > Rob
> > K5UJ
> >
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