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Old 11th July 2009, 12:25 AM   #1
dhenryp is offline dhenryp  United States
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Default Pretty Big Horn

This is a black loaded horn for the Fostex FX120. I was drawn to the FX120 because it has a pretty smooth response (for a Fostex full ranger) and a pretty big Xmax of 2mm (again by Fostex full range standards). There is a pair of these winging their way from Wisconsin as I type.

The horn has a two meter path length, ~ one meter height and 14cm (7.5") internal width so it's significantly bigger than either my Bugel Horn or Little Big Horn. It has the same basic folding as the Little Big Horn, which I've found to be efficient and effective.

As always, advice/comments/suggestions are welcome.

Re: the name - does it mean a fairly large horn or attractive large horn? Yes.
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Old 11th July 2009, 12:38 AM   #2
dhenryp is offline dhenryp  United States
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Here is the hornresp simulation. With room gain, it should reach into the 50's. The 2mm Xmax will also allow pretty high levels (110db + per hornresp) down to ~ 50hz.
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Old 11th July 2009, 12:48 AM   #3
dhenryp is offline dhenryp  United States
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Hornresp Max SPL.
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Old 11th July 2009, 01:02 AM   #4
dhenryp is offline dhenryp  United States
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Almost forgot - many thanks to Robert (rjbond3rd) for collaborating on this horn.
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Old 11th July 2009, 01:06 AM   #5
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Wow! I love the floor exit -- you cleverly avoid a 90-degree fold in wood. Right off the bat, it looks like there are a couple ways to enlarge the chamber by recovering some volume in the null areas.

Really nice! It will be very interesting to see what drivers can work (given the ability to adjust chamber volume).

Edit: Denis you are too generous -- I'm more of a shameless groupie.
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Old 11th July 2009, 03:23 AM   #6
chrisb is offline chrisb  Canada
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For a pretty damned big back loaded horn, check out Nelson Pass' Kleinhorn




Click the image to open in full size.



"pretty" as in visually appealing is of course in the eye of the beholder, but as far as dimensions are concerned, of that there is no dispute
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Old 11th July 2009, 04:13 AM   #7
doorman is offline doorman  Canada
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I'd love to hear them, the "industrial look" would more than wave a red flag around here though!
Don
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Old 11th July 2009, 11:28 AM   #8
AndrewL is offline AndrewL  United Kingdom
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Something else those aren't they, make the Sakicho's look small and that takes some doing.

-- Andrew
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Old 11th July 2009, 11:43 AM   #9
dhenryp is offline dhenryp  United States
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I forgot to mention; these are going to use the same materials as the Bugels and Little Bigs - solid poplar boards( 1X 8 this time) and plywood sides. I really like being able to screw into the edges of the poplar boards and get a firm grip.
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Old 12th July 2009, 01:29 PM   #10
dhenryp is offline dhenryp  United States
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Here it is in the flesh/wood. With some luck I'll have one together and making sound today.

I've decided to make the front baffle and throat wedge removable and interchangeable. This will give me maximum flexibility in trying other drivers. For instance, Hornresp shows that the speaker should work very well with the Fostex FE166E with a small change to the CC volume and throat wedge.
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