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Old 30th August 2005, 11:19 PM   #11
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Quote:
Originally posted by consort_ee_um
Here's a fragment of the patent 2694462 filed in 1951
The radiotron link does not seem to work anymore. Apologies

Thats a lot different in concept from the first posted here:

is quite different from RJ:
http://perso.wanadoo.fr/supravox/Do...s/caissonrj.pdf

The patent really does not make as much sense. If the XO point is not low enough.
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Old 31st August 2005, 06:45 AM   #12
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Yes, the reason I had not heard of the design is that it does not work as a full range speaker. There is a hole in the response from about 100 to 500Hz because you only get the port output.
It is perhaps the first subwoofer design though, the patent having a good description of how to do the design.
The idea of mounting the woofer with a gap to its baffle is mentioned in the patent but this is not really what the patent is about, so modern designs with that only that feature should not be called RJ
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Old 31st August 2005, 09:31 PM   #13
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Just read the supplement to the Radiotron designers handbook.
More on the RJ enclosure quote:
When the speaker is intended to handle a wide frequency range the central portion of the cone must not be obstructed by the frontal board.
The drive unit is mounted on a "speaker board" which is mounted a short distance behind the frontal board. By decreasing the spacing between these two board it is possible to lower the Q of the system.
It seems that Robbins and Joseph (RJ) realised the flaws of the original patented design and modified it.
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Old 1st September 2005, 01:51 AM   #14
soongsc is online now soongsc  Taiwan
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Quote:
Originally posted by consort_ee_um
Just read the supplement to the Radiotron designers handbook.
More on the RJ enclosure quote:
When the speaker is intended to handle a wide frequency range the central portion of the cone must not be obstructed by the frontal board.
The drive unit is mounted on a "speaker board" which is mounted a short distance behind the frontal board. By decreasing the spacing between these two board it is possible to lower the Q of the system.
It seems that Robbins and Joseph (RJ) realised the flaws of the original patented design and modified it.
That seems to be this design.

Quote:
Originally posted by plovati

is quite different from RJ:
http://perso.wanadoo.fr/supravox/Doc.../caissonrj.pdf

I kind of wonder what this casuses to light cones.
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