check out the following....
patents by Paul W. Paddock
Google search using Google Patent (click on "more" then click on "even more")
You can also take a look at "A DIY speaker of a different kind" which is an active thread on a diy version of this design. There have been other threads buty you will have to search yourself.
in no particular order
4684439
5064815
5570429
5450497
6061416
5230021
4903308
5727076
5652801
5249237
5198624
5446797
patents by Paul W. Paddock
Google search using Google Patent (click on "more" then click on "even more")
You can also take a look at "A DIY speaker of a different kind" which is an active thread on a diy version of this design. There have been other threads buty you will have to search yourself.
in no particular order
4684439
5064815
5570429
5450497
6061416
5230021
4903308
5727076
5652801
5249237
5198624
5446797
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