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Ever think of building a Cornu Spiral horn? Now you can!
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Old 29th November 2020, 05:25 AM   #2771
db6546 is offline db6546  United States
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Thanks, guys.

The driver is an Aurasound Whisper. They were $12.50 on sale.

Aurasound NSW2-326-8AT Whisper 2" Extended Range Speaker Driver 8 Ohm
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Old 29th November 2020, 05:50 AM   #2772
planet10 is offline planet10  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Thanx, similar construction and size to the ne si mentioned.

dave
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Old 1st December 2020, 01:42 AM   #2773
db6546 is offline db6546  United States
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I started laying out the 20" plans on the bottom plates and didn't feel like poking all those holes.
So I came up with another approach. I laid my plan on the bottom plate and pushed three pins in for alignment. Then I put the pattern on the second bottom plate and pushed those pins in again. Now I can remove and replace my pattern on both plates and keep the pattern aligned.

Then I cut the pattern on the outside line in 90 degree segments. I traced the pattern outline, put it on the second plate, and repeated.

Cut on the outside again in 90 degree segments. Trace again.

Repeat. Once you get past the second set of vanes you can cut in 180 degree segments.

It turned out pretty good. It's more accurate than the hole poking method I used on my first set. It may not make any practical difference, but satisifies my OCD.
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Old 4th December 2020, 02:37 PM   #2774
haraldkasper is offline haraldkasper  Sweden
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Click the image to open in full size.

i built these for my wife with Fostex FF125K

Last edited by haraldkasper; 4th December 2020 at 02:42 PM.
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Old 4th December 2020, 03:05 PM   #2775
Cindra is offline Cindra  Croatia
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Old 4th December 2020, 04:53 PM   #2776
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Quote:
Originally Posted by db6546 View Post
I have a pair of RS 40-1354 drivers and may have to try them in a 3' by 5" Cornu.
You will not be disappointed. That driver in that size Cornu is still the finest I have built to date.
Damn the torpedoes, full speed ahead!
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Old 4th December 2020, 05:49 PM   #2777
planet10 is offline planet10  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Harald,

I have some tricks that help tame the FF125wk.

dave
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Old 4th December 2020, 08:23 PM   #2778
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
What are you taming Dave? I found that driver rather subdued in it's delivery.
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Old 4th December 2020, 09:05 PM   #2779
planet10 is offline planet10  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Wasn’t yours already worked over?

Stock they have some ringing that takes some tweaks and long brealin to minimize.

dave
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Old 5th December 2020, 01:24 AM   #2780
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
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i built these for my wife with Fostex FF125K
Bravo! Nice job. How does your wife like them. The astrology motif is genius. I know lots of people who are into that.
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