Page 5 of 5

Re: Questions Regarding Horn Design and Dimensions

Posted: Wed Nov 24, 2021 2:01 pm
by CarlosV
TN Allen wrote: Wed Nov 24, 2021 10:21 am Remarkably the video made it onto YouTube. It is rough but gives a sense of the sound. The 60Hz. hum is the shop electrical system. I moved around trying to get a sense of the sound at different angles and distances. As I explain in the text accompanying the video, the shop acoustics are awful.

https://www.youtube.com/watch?v=6hoKI7mJFyA
Remarkable outcome! it sounds great, congratulations! - and yours is a very nice shop.

Re: Questions Regarding Horn Design and Dimensions

Posted: Wed Nov 24, 2021 2:57 pm
by TN Allen
Thank you for the complements. The more I listen to the video sound, the more I think the horn has promise. I don't know enough about Wilson and Webb, but suspect that they not only relied upon mathematics but a robust intuitive sense of experiment and design. I wish I had known them. I was concerned that adapting their dimensions to a spiral horn might not work out well, but their guidance on bends in transmission lines seems as good as their cross section and length data. Does anyone know if they designed and built a spiral horn? I suspect they may have.

The shop is not mine. I teach in it, but it is part of Maine Maritime Academy in Castine, Maine. It is indeed a very nice shop, and I am fortunate to have it as a "second home".

Re: Questions Regarding Horn Design and Dimensions

Posted: Thu Nov 25, 2021 3:48 am
by emgcr
TN Allen wrote: Wed Nov 24, 2021 2:57 pm Does anyone know if they designed and built a spiral horn? I suspect they may have.
I have never come across one but they might well have done...............a great number of experiments were carried out.

Re: Questions Regarding Horn Design and Dimensions

Posted: Thu Nov 25, 2021 11:15 am
by CarlosV
emgcr wrote: Thu Nov 25, 2021 3:48 am
TN Allen wrote: Wed Nov 24, 2021 2:57 pm Does anyone know if they designed and built a spiral horn? I suspect they may have.
I have never come across one but they might well have done...............a great number of experiments were carried out.
I have never seen a spiral horn neither, but a spiral tone arm was built. It was made of wood, and looked very well done, on a English cabinet machine I tried to buy years ago, but unfortunately I was the underbidder. I never saw another, so that one may be a unique model.

Re: Questions Regarding Horn Design and Dimensions

Posted: Fri Nov 26, 2021 8:04 am
by TN Allen
I searched the subject and found this discussion:

viewtopic.php?t=1190

Is the Pugh phonograph the machine you decribed with the spiral tonearm?

Re: Questions Regarding Horn Design and Dimensions

Posted: Fri Nov 26, 2021 8:37 am
by CarlosV
TN Allen wrote: Fri Nov 26, 2021 8:04 am I searched the subject and found this discussion:

viewtopic.php?t=1190

Is the Pugh phonograph the machine you decribed with the spiral tonearm?
Exactly! I had forgotten about that old thread. I remember having bidded for that machine but did not get it at the end.

Re: Questions Regarding Horn Design and Dimensions

Posted: Fri Nov 26, 2021 11:24 am
by neilmack
Would pointing your 'oyster' horn at a wall, or into a corner, provide some extra range or volume?

Re: Questions Regarding Horn Design and Dimensions

Posted: Fri Nov 26, 2021 2:54 pm
by TN Allen
It probably would. The shop space is 50'X150' and about 12' high, and with concrete walls, floor, ceiling and machinery, it no doubt detracts from the sound.

I suspect in a residence it might have sufficient volume. Your idea is interesting, when the entire assembly is easier to move, I'll try a corner.

Re: Questions Regarding Horn Design and Dimensions

Posted: Sat Nov 27, 2021 11:16 am
by TN Allen
"Exactly! I had forgotten about that old thread. I remember having bidded for that machine but did not get it at the end."

That machine would have been not only expensive but time consuming to build. Even now with CAD and CNC machining it would be time consuming, and quite expensive if one were to pay the hourly rate for the design and machine. It is beautifully made though.