Re: spherical speaker enclosure

On 27 Apr 2006 07:10:37 -0700, suraj.joneja@xxxxxxxxx wrote:

I remember reading somewhere that spherical enclosures are ideal
shape..is that correct? debatable?
Incidentally, I live in India where we get *Very Cheap* earthen pots,
called "matkas" which are near perfect spheres with 'mouths emerging
from protruding necks', used for storing water, and they keep the water
inside cool (as they are porous I guess).

I wish to build a speaker enclosure using them, as they are ready made
in various sizes, have an artistic appeal and if the sound reproduction
dose not suffer, It's a very attractive proposition!
These pots or "matkas" have walls which are usually 3-4 Milimeter
thick ( I can get them made thicker).

I did some tries by mounting 8 inch drivers on the "mouth", did some
stuffing inside using polyfill, but the observed sound reproduction did
not seem too "right" to me- I thought it was resonating too much (like
booming) at low freqs. and had a tinny feel to the sound..

Please have a look at the setup here:
http://www.geocities.com/madforeagles/DSC01343.JPG
http://www.geocities.com/madforeagles/DSC01344.JPG


My queries are, should I line the insides with some material to make it
air tight? how thick should I get them made? should I use the same
volume calculations for 'normal' enclosures for a driver? should I
stuff it with Polyfill?

Thanks!
Suraj

The earthenware matkas you are using have such thin walls that they
would resonate like hell for starters. They would need to be very
rigid with walls at least 25mm thick and they would need to be of the
correct volume for any specific driver.

An example of commercial spherical speakers
http://www.fredwilliamson.com/coration_speakers.htm
.

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