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Jim, I know who Earl Geddes is. I think a couple years back we exchange a few emails where his attitude was that although he appreciate and mostly agree with some context of my site but he is not wiling to acknowledge it because he was afraid that any, even virtual, association with me might hurt the publicity of his business - it was actually what he wrote to me. Later I learned that he was seen hang around some dirtiest scams in audio industry, so, he need to develop his “publicity” as far as possible from me as I know the real price of all that crap.

You see, this is the problem with industry people: they are effective only up to point of public acceptance and marketing wrapper-ability. I still do not know how much rational in the Earl Geddes’ loudspeaker. As “a loudspeakers person” I have seen/heard quite a few new interesting and original ideas in loudspeakers, some of them were base upon deep theories. When I was exposed to some of them so far was able to see that all of those inventors do not really realize the level at which the “definition of success” might operate.  They crate in their mind abstract virtual target and build theories to address them. However, the total level of their Sound is/was way sub-qualifying, and those people really have no idea what they dealing with and presume that anyone in audio is easy to impressed as the Moron-infected AA audiences or the bottomeaters from Midwest audio shows. I do not know if it is the case with Earl Geddes but looking at the community of his associates he swims in the very shallow water.

I very much understand his agenda and I have nothing against it. However I have my own agendas as well: I would like to see what else is possible in horn-loaded topology loudspeakers. I spent quote a lot of time, money and interest in the subject and I feel that I posses some more or less interesting results and more or less valuable experience. From the position of my experience I might assure you that the Earl Geddes’ comments about horns, although might have some purely theoretical values, but have no applied meaning. I would like to pay attention that theories do not make the thing work – it only explains the events. The explanations might be incorrect and in that case the explanations-based practice become completely not applicable. It is exactly what happen when Earl Geddes open his mouth about horns. Bruce Edgar, the person who has order of magnitude more knowledge, understanding, practice and education in the horn universe does not feel that any firm theories that he know might explain horns sound in it’s completion and he feels, very much as I do, that in many cases the results from horns are completely erratic. So, the only one ways that I respect in horns is to do the things, to observe the result and then, to navigate yourself to the direction that you feel is more perspective.

Wojtek above said: “I came to conclusion that …. his graveyard system …. is almost the only way to go.” He might not really realize how close he is. If you look at some very few fundamental rules of proper horn installations (like time alignment, narrow bandwidth and proximities from the boundaries) and take under consideration the geometry and size of the horns then very-very few proper horn configurations might be available. In fact for 4”+1/5”+T situation, that do not go down 100Hz, there are no other configurations then Macondo and it is the only way to go… You might change the drivers for whatever you like but the basic configuration would be still there…

Anyhow, unfortunately Earl Geddes does not operate in the word of horn and he for whatever reasons decided to promote his AA-thrill ideas by presenting and attacking irrelevant dead concepts of horns. With the same result he might attack listening condition on Mars or Jupiter and claim that his loudspeakers that might reproduce minus 12Hz would be perfect for a listening room on Jupiter. Once again, I did not read his book and did not listen his drivers but from what I was able to observe about Earl Geddes was not at the level witch might attract my attention. It someone heard what Earl speakers and feel that they do more then “habitual AA sound” then let me know. I doubt…

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