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In Reply to: RE: Tracktrix Horn Upgrades posted by Paully on July 17, 2016 at 12:58:50
I made these DIY 200Hz Tracktrix horns a couple of years ago, and would do the same approach again. But with one modification.
In stead of the 2" throat, I would made them extend to a 1,4" throat reaching inside my 2" exit drivers.
The very last bit would be a 3D printed insert into the driver exit, making the horn flair starting at the very bottom of the driver.
Follow Ups:
Those are gorgeous and the type of thing I had in mind. How much to make me a pair?! Or do you offer a translation service for the DIY site? :)
The basic idea came from John Inlows "paper horns", but I used a chicker caft paper, making mine more rigid than his.
I used the Volvoteterīs excel shart for the horn flair calculations, aiming for 200Hz cutoff. This ended up in a 560 cm horn mouth and about the same length.
As for the driver I now use Radian 750Pb (2" membrane, 2" exit) -driver which sounds really fine with these horns. I have tryed some x-over setups and are now using a simple 55uF cap for a 350Hz 1st order filter (a stepper filter would make it possible to go lower).
The Radian driver starts to fall of about 15kHz which could be considdered to low, but I really prefer this sound without the pair of Fostex super tweeters I also have in my possetion.
Try google translate for the translation.
If I could make a pair, so can you.
Super tweeter is a thought for further down the line. I have built amplifiers from directions, if I can get the directions sorted out for this I will see what I think. It looks good along with a couple of other options. I appreciate the input and encouragement. I have one driver, after I get one more I can start on this!
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