Something Stirs in the Workshop

Dedicated to those large boxes at one end of the room
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vinylnvalves
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#76 Re: Something Stirs in the Workshop

Post by vinylnvalves »

Regarding the fins.....”Superior off-axis performance is achieved by virtue of the ES Flare geometry eliminating the need for dispersion fins”

No personal experience/opinion on the fins, however on jet engines we got rid of the multicell ducts when our understanding of fluid dynamics improved. It wouldn't surprise me if a similar thing is going off here too.

Replicating horns - I don’t have the scanning equipment to reverse engineer a horn. I do have software to design Geddes CD horns, round or elliptical.
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IslandPink
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#77 Re: Something Stirs in the Workshop

Post by IslandPink »

I don't really know either, because unless you use a fluid dynamics simulation of the wavefronts , which most programmes aren't you won't have a clear idea at what frequency the waves part company with the sidewalls. Just because the area expansion is fine, doesn't mean you can persuade eg 10kHz to stay in contact wit the horizontal expansion. I suppose you could use Hornresp and the wavefont simulation, and treat the elliptical expansion as two different cases ( H and V ) and see how each looked at the higher frequencies - might be close.
In any case the Yuichi is not high-fidelity beyond 5kHz, I think the fins just smear out the wavefronts, the tone is lost, but it doesn't sound harsh, that's what i found , so bringing in a tweeter is more successful.
I haven't got any detailed feedback from Chris about his friend in Brighton and how his elliptical wooden tractrix ( or Le Cleac'h ) sounds/tests .
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iansr
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#78 Re: Something Stirs in the Workshop

Post by iansr »

vinylnvalves wrote: Sat Aug 07, 2021 12:33 pm It’s an ES290 horn, Troy Crowe’s design.
A stack of the layers( not glued up yet)
9CE9B7C7-C666-4D30-AC83-4220A3A726C4.jpeg
Looking good Steve 😀.
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iansr
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#79 Re: Something Stirs in the Workshop

Post by iansr »

These horns are not intended to cover the higher frequencies and in this particular case they will be crossed over to some Fostex 925A tweeters.
"Its good enough for Government work."
vinylnvalves
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#80 Re: Something Stirs in the Workshop

Post by vinylnvalves »

I have finally finished the horns off for Ian. You wouldn’t believe these absorbed almost 2.5 litres of finish. I now know why Ikea, 2k lacquer their birch products, birch ply is like a sponge. [attachment=0]8D247872-3D50-4813-A157-0A376AA1954D.jpeg
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IslandPink
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#81 Re: Something Stirs in the Workshop

Post by IslandPink »

Superb !
The finish is great and worth it sonically as well as aesthetically.
Last edited by IslandPink on Tue Nov 02, 2021 6:26 pm, edited 1 time in total.
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iansr
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#82 Re: Something Stirs in the Workshop

Post by iansr »

Yes superb work by Steve, I’m a lucky boy!
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vinylnvalves
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#83 Re: Something Stirs in the Workshop

Post by vinylnvalves »

I now have to come up with a world beating speaker in 3 weeks for Owston...... so many drivers and so little time :(
I have been playing with this
9E771326-D8D7-4AD2-91A1-E4B4C13681B7.jpeg
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. It’s an acoustic filter to get rid of the 8k nasty response for the Beyma TPL if you change the back chamber Not my design, I just had to 3D print it. Not to shabby in the response.
824B0B2F-B365-4F33-AF86-EEE665051504.png
824B0B2F-B365-4F33-AF86-EEE665051504.png (89.46 KiB) Viewed 12663 times
Whether I use the TPL’s you will have to wait and see.
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Paul Barker
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#84 Re: Something Stirs in the Workshop

Post by Paul Barker »

Awsome!
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Ray P
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#85 Re: Something Stirs in the Workshop

Post by Ray P »

vinylnvalves wrote: Tue Nov 02, 2021 5:42 pm I have finally finished the horns off for Ian.
Beautiful!
Sorry, I couldn't resist!
steve s
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#86 Re: Something Stirs in the Workshop

Post by steve s »

Wow, really nice.. looks like we going to have an interesting meet
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
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Dave the bass
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#87 Re: Something Stirs in the Workshop

Post by Dave the bass »

Flippin Shoddy!
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Cressy Snr
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#88 Re: Something Stirs in the Workshop

Post by Cressy Snr »

Bodes well for Owston :D
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vinylnvalves
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#89 Re: Something Stirs in the Workshop

Post by vinylnvalves »

Those horns won’t be used at Owston, unless Ian has other plans....
vinylnvalves
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#90 Re: Something Stirs in the Workshop

Post by vinylnvalves »

Maybe I have confused the situation by posting the Freq response curve soon after the pictures of the horn.... that for a Beyma TPL with an acoustic filter fitted not the wooden horns.
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