Ever think of building a Cornu Spiral horn? Now you can! - Page 32 - diyAudio
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Old 5th January 2013, 11:40 PM   #311
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If I measured correctly it's 27 cm^2 for the driver and who know how close I was on the actual throat openings. Tomorrow's honey-do-list looks clear until about noon so maybe I can give them a test.

Them there Jordan's have been gathering dust since the project below went south a couple years ago. Please note the Margarita machine in the background, even upside down it's huge when it comes to speaker inspiration.
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Old 5th January 2013, 11:54 PM   #312
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Some measurements.
Loudspeaker hung on the wall, 170 cm (5.6 ft) from the floor, 140 cm (4.6 ft) from the ceiling, microphone (not calibrated) at 1 m (3.3 ft), gate of about 6 ms.
The red graph should be MLS, green the sweep.
Frequency response is more irregular than that posted by Pano (here) but the same notches at 50 and 200 hz are presents.

I cannot exclude I did something wrong, I'm not an expert in measuring loudspeaker.

PS: happy new year
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Old 6th January 2013, 12:10 AM   #313
xrk971 is offline xrk971  United States
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Switters,
Nice work, thanks for sharing. I can't keep track of everyone's particular builds. Is this 50 cm cornu with vifa? We should put together a table with everyone's build info...
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Old 6th January 2013, 12:36 AM   #314
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Hi xrk971,
These are the 50 cm version with Fountek FE85.
I'll build also the 70 cm version, but I wish to study and better understand horn loading before.
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Old 6th January 2013, 01:21 AM   #315
xrk971 is offline xrk971  United States
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That is amazing that the little Fountek has output at 45 Hz.
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Old 6th January 2013, 08:39 AM   #316
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Quote:
Originally Posted by xrk971 View Post
That is amazing that the little Fountek has output at 45 Hz.
Yes, it shoudn't
I think it could be room reinforcement or environmental noise (or me doing something wrong).

PS: when I wrote my post it was a bit too late for me, in the graph posted by Pano there is no notch at 50 hz.
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Old 6th January 2013, 11:20 AM   #317
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here is the picture of the setup. the Cornu plays on a serviced and upgraded Quad 33/303. yesterday i put in some different stuffing and i think i an getting there...
sorry for the quality of the photo.
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Old 6th January 2013, 01:56 PM   #318
xrk971 is offline xrk971  United States
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Xerxes,
Very nice build! I like your setup. How does the reel to reel tape sound on the cornu's?
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Old 6th January 2013, 01:58 PM   #319
xrk971 is offline xrk971  United States
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For those of you building the Cornu in foam, if you have an interest in building the FH3 in foam, I just posted build pics and first impressions on the foam core thread. It's a winner also.
Foam Core Board Speaker Enclosures?
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Old 6th January 2013, 02:17 PM   #320
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Ah thanks! This is my little vintage setup which i love, the reel to reel sounds good and silence is silence...no cracks or noise. I must say I prefer my turntable but the Tape brings back good old memories.
The sound of the Cornu is still a little hollow but the longer I play the more the frs8 loosens up so I will wait with new stuffing.
I am curious at your horns, I will take a peak
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