| Subject: | Re: [RESOGUIT-L] Re: coverplate open area | | Date: | Sunday, January 8, 2006 12:15:46 (-0500) | | From: | Gary L. Stone <mstone22 @.......net>
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| In reply to: | Message 2127 (written by DeweySlideWell) |
This is an excellent point in that two sound waves, or any other waves,
exactly in phase will double the amplitude or volume. In physics it's
called harmonics. Of course the backloading or baffling would have to be
done to exact specifications or you wouldn't achieve the maximum effect. The
real art of it is amplifying the maximum possible frequencies. Back to the
engineers and micrometers again!
Rat Man
> Bobby Wolfe used to talk about "backloading" the cone.
> In general, this means placing in the body cavity, a
> soundwell, scoop or an actual baffle.
> The point is to stop the air (which carries our sound)
> from being able to simply rush right out of the body.
> When done properly, it makes for more tone, more volume
> and a better sounding guitar than the same model without
> this modification. I know there are others who may disagree.
> This is just one way of doing things here, though I for one
> think it is the best way. My theory is that the backloading
> does several things. One is to compress the air within the
> cavity more than it would be otherwise. Compression equals
> amplification in this instance. It also serves to add a *slight*
> delay to the wave, helping to nullify the problem of the wave
> from the bottom of the cone tending to cancel out the wave
> from the top of the cone. Two sound waves 180 degrees out
> of phasecan cancel each other out you see. I think they call this
> the Science of white noise.
> A baffled body makes the wave from the top of the cone more
> pronounced. Most of the bass comes from inside the body,
> most of the treble comes from the top of the cone. A baffled
> body enhances the treble, by modifying the Bass.
> The body cavity is The Bass Chamber. The air space between
> the top of the cone and the bottom of your coverplate is The
> Treble Chamber. The same principles apply to this chamber as
> they do to the body cavity. The parts of the coverplate which are
> *not* open are your baffle/soundwell here. BALANCE between
> these chambers is what makes a good Dobro sound.
> That is why I say that perhaps having too much open area is not
> necessarily a good thing.
> Good luck,
> D - S - W
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