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be wrote :
"...Loking at the pictures it seems to me that you are using felt in front of the chamber front plate to seal the coupling between the horn and the chamber? This could cause some problems if the felt sheat is open towards the horn throat..."

Hello be,

Thanks for your advice (and for the compliment).

You are correct, the felt is between the mating faces of the removable chamber and the horn. However, the hole in the felt is the same size as the throat of the horn, so the only part of the felt that is "exposed" to sound pressure is that which is found on the inner edge of the hole in the felt seal (about 3.5mm when compressed). Did you understand that this was the case?

"...My experience with placing felt in the throat area is that it is very effective in making the sound go flacid.
Maybe, to avoid possible problems, you could use a rubber o ring or some corck?..."

Though I have not detected any "flaccidity", using another material here would be simple, and would remove any doubt. Before doing anything, I might try crawling up into the horn and covering the edge of the felt seal (the part that's exposed to sound pressure) with aluminum tape; this stuff is should allow bridging the 3.5mm gap with enough rigidity to get an idea.

jd*

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