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RE: optimal horn type




So it is a straight MDF horn for the ALE P1260 driver with a 75mm throat:
The Tactrix flare rate is the shortest one so you can play around with this page untill you reach a compromise on size vs lowest freq.

http://melhuish.org/audio/tractrixcalc.html

The main problem will be to time align the driver with the next 800hz driver.

"Apparently, tractrix is not ideal below a mouth circumfrence of approximately 88 cm ( more or less 100 hz )"
I think you are refering to the John Hasquin quote:
" I would advise you not to make a horn any bigger than 88cm mouth. The 95cm mouth horn is too big and you will not be able to get good high frequency out of it. A 95cm mouth horn with 10cm throat will be about 92cm deep. For a horn that is between 80cm to 73cm deep, you will need a very efficient speaker like the Fane Studio 8M or the Ciare 8.5 Nd MR "

I think he meant this for a horn coupled to a normal 8" speaker like the Studio 8m or say a Lowther speaker (for comparison purposes only). With a specialized compression driver like the ALE P1260 you can almost use any size and lenght horn you wish...
Dont go for a terribly long horn I think time alignment is key here...
Or you can just forget about time alignment and get any lenght horn and see how it sounds....

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