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Old 14th January 2013, 10:29 AM   #41
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Actually, the shape can matter, but in this case it does not since the aspect ratio is not extreme enough to have any effect.
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Old 18th January 2013, 12:39 AM   #42
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I'm surprised that nobody has attempted this horn build! Seems like it would be a good design that would work with a few different drivers. It's certainly well documented and seems like a no brainer!

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Old 18th January 2013, 03:58 AM   #43
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Get on with it then.
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Old 18th January 2013, 07:46 PM   #44
DrBoar is offline DrBoar  Sweden
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Come monday I go and have me some cut OSB board. I have procrastinated long enough!

As I am strung to the mast, I may as well promise some pictures and measurements next week...
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Old 18th January 2013, 08:18 PM   #45
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Excellent. Look forward to seeing them
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Old 18th January 2013, 09:08 PM   #46
Colin is offline Colin  United Kingdom
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Ditto.

If I was going to try a horn/TL like this, MJK's article would give me the confidence to try this design.
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Old 18th January 2013, 10:47 PM   #47
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I must say, it was a shock to me to read in that article that Martin himself has never made a horn! In any case, I'll also be watching to see what you have to say, DrBoar...
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Old 21st January 2013, 10:03 PM   #48
DrBoar is offline DrBoar  Sweden
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Here we go, I used 11 mm OSB ( I am trying out an other prototype that might look retro in OSB). Not to keen on the material rough and flaky as it is. I had the sides cut to size and then just 6 strips 180mm wide and about 700 mm long. I used a pull saw for the cutting of the various smaller parts that all are 180 mm wide.

Click the image to open in full size.

I used white wood glue, plenty of it to seal the various parts. Late in the evening I discovered that I had no window sealing strips, I cut up some wider sealing strips/insulation. My luck as the glue sticks way better than window sealing strips. That corner clamp is a handly little thing!

Click the image to open in full size.

Click the image to open in full size.

I used clamps to attach the side, I will get some more clamps from the garage before I start doing all the measurements. But that will not be today, but soon

Click the image to open in full size.

The plan for measurements are as follows:
Impedance: (Dayton Woofer Tester )
Frequency response: (Omni Mic diver near field and horn opening)
Conditions: totaly empty, damping material as Kings article. Variants with various compartments with damping material removed.

Last edited by DrBoar; 21st January 2013 at 10:13 PM.
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Old 21st January 2013, 10:32 PM   #49
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Looking good!
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Old 21st January 2013, 10:53 PM   #50
IG81 is offline IG81  Canada
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Nice prototype DrBoar! I dig the top-mounted terminals, like I did on my little BLH for FF85WK - function before form! I'll be looking forward to your measurements.

FF85WK back load horn - YouTube

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