High Efficiency Speaker Asylum

RE: baffle shape for horns

24.12.53.204

In Reply to: RE: baffle shape for horns posted by Jmmlc on June 13, 2008 at 09:57:21

Jean-Michel

There are a great many things Dr Geddes would disagree with me about, but the link you have provided does not seem to be one of them. Here is Dr. Geddes from that link: "There is no advantage to round or square either way....But since the throat for ALL compression drivers is round, there is an advantage to keeping the cross section round. But square can be dealt with,...". The quote by GM in Dr. Geddes post in the link seems to reference a prior comment by Dr. Geddes which GM interpreted as concerning the inferiority of square horns, but I could not find such a remark on that particular page. At any rate, I agree with the above statement by Dr. Geddes, and I do not see how it is inconsistent with what I have said here. Perhaps you can point out where you feel it is.

I am always surprised to find a point I agree with Dr. Geddes on, however a bit up-page in the link he states the following: "The understanding of waveguides will completely overturn and throw out all prior horn theory based on the Horn Equation" (the "Horn Equation" is a reference to Webster I believe). With this we are back on a familiar battle ground with Dr. Geddes. He ran into trouble on this forum with statements that he was convinced that what "we" want are horns (i.e. waveguides) that sound like direct radiators. If this were true for anyone, they would be well advised to just buy/build direct radiator speakers in the first place, they are easier to design and build and generally much smaller and cheaper than horn systems. Relatively inexpensive transistor Watts and high temperature speaker voice coils should have made horns obsolete years ago, but here we are on this forum discussing them. Dr. Geddes is still waiting for the great fall which, by this logic, should have come in the late 70's.

I'll have to wait for the dollar to improve before I make it back to Paris. Regards from Chicago.

Paul

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