| Subject: | [RESOGUIT-L] Re: Choices in the GOLDEN AGE of Reso. | | Date: | Thursday, November 3, 2005 07:21:18 (EST) | | From: | DeweySlideWell <DeweySlideWell @...com>
|
Dick DeNeve wrote ( along with a lot of other informative things):
>> That is, the large surface area of the cone moving in slightly pushes a
pushes a jet of air out of the ports, or sound holes. <<
There are two other things I try and consider here as well. One is that since
the sound waves coming from the back of the cone are *almost* 180 degrees
out of phase with the sound waves coming from the top of the cone,
it would seem that another degree or two of separation could possibly make
for a better sounding guitar. This is because two similar sound waves which are
*exactly* 180 degrees out of phase will tend to cancel each other out.
(I think this is one reason why some guitars sound weak.)
That is why I like baffles... I feel they offer that extra degree of "delay"
between the upper and lower sound waves.
The other thing, which hardly anybody seems to take into account, is the fact
that air can be compressed. This action adds *power*. (Who hasn't blown up a
balloon and released it to watch it fly around the room??)
The action of the cone pumping downward into the body cavity produces our
sound wave, but it also compresses the air inside as well. A baffle further
enhances this process. From my experiments, it seems that in the case of the air
inside the body cavity of a Dobro, compression equals an increase in the
volume of the sound. The trick is to get it all done right. Just my opinions,
others may have something different to say.
Good luck,
D - S - W
|
Re: Choices in the
Reply to this message