Le Cleach horn profile query

vinylnvalves · 29th September 2011, 06:35 PM

I am proposing to make some adaptors to reduce the throat of my 250Hz Le Cleach horns down from 160mm (for Lowther) down to 52mm for a 2" compression driver. When i used the Le Cleach calculator i have found that the profile does not simply extend backwards. Looking at the spreadsheet it looks as if the natural expansion routine it is using will give a different profile for every throat size. Attached is a graph showing how the profiles differ - what should i do, curve fit a profile "that smooth" from my current throat backwards or ?? suggestions please, as i dont know how sensitive the throat portion of the horn is.
i will be making flanged fibreglass extensions which will bolt on to the back of the existing horns.

revintage · 30th September 2011, 05:37 AM

Interesting, have never compared the flares before. What happens if you adjust T of the 2" a little to see if a better compromise can be done? Looks like it will be a real "bump" now.

Why not move this to the "Jean Michel......" thread. Think there might be a better chance to get an answer there.

Just a little note: A JBL 2" is 49mm at its end and a 50mm throat will then be what you should go for. JBLs are 5 degrees, but you probably knew.

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30th September 2011, 05:37 AM	#2
revintage diyAudio Member Join Date: May 2007	Interesting, have never compared the flares before. What happens if you adjust T of the 2" a little to see if a better compromise can be done? Looks like it will be a real "bump" now. Why not move this to the "Jean Michel......" thread. Think there might be a better chance to get an answer there. Just a little note: A JBL 2" is 49mm at its end and a 50mm throat will then be what you should go for. JBLs are 5 degrees, but you probably knew.