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Ever think of building a Cornu Spiral horn? Now you can!
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Old 1st January 2018, 06:20 PM   #2361
iinself is offline iinself
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Hi,
I got a pair of W5-1611SAF, 5 inch drivers and am looking for a enclosure and came across this forum and now I have so many enclosures to try

Reading the posts, it looks like I have to build a 36 X 36 spiral about 5 inches deep?
Can I make it a about 7 inches deeper and reduce the spiral size to say 30 X 30 or lesser?

thanks
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Old 1st January 2018, 07:04 PM   #2362
planet10 is offline planet10  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
The length of the horn is important, shrinking the size will reduce the bass extension.

dave
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Old 1st January 2018, 11:20 PM   #2363
iinself is offline iinself
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thanks Dave
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Old 3rd January 2018, 01:38 AM   #2364
hollowboy is offline hollowboy  Australia
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Quote:
Originally Posted by iinself View Post
Hi,

Can I make it a about 7 inches deeper and reduce the spiral size to say 30 X 30
If you wanted to make the design deeper, you could make each horn channel narrower by the same ratio.

The area of each horn channel would be the same, but they'd complete more laps around the centre, thus allowing a longer horn path in a square truncated to 30'
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Old 14th January 2018, 10:35 AM   #2365
Doctor Why is offline Doctor Why  Germany
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Hi Guys, Sorry for the delays - unfortunately I'm not quite fit yet. I'm still a bit weak on my feet and I do not feel like doing anything but lying on the sofa and listening to music ... ... but it goes on slowly. After some minor preparatory Work I start now with the horn courses ("The Snail"). Below are a few Pictures of the Snails that have just been put to test (not yet glued) - as they will look like later. The rest of the pictures are self explanatory. LG D.W.
Attached Images
File Type: jpg Back Plate (total).JPG (38.2 KB, 333 views)
File Type: jpg Back Plate Speaker Rods.JPG (37.2 KB, 338 views)
File Type: jpg Distance Block.JPG (34.4 KB, 332 views)
File Type: jpg Front Plate Speaker Mounting.JPG (49.5 KB, 306 views)
File Type: jpg Parallel Plates.JPG (49.0 KB, 312 views)
File Type: jpg Side View w.o. Snail.JPG (41.9 KB, 85 views)
File Type: jpg Snail unglued I.JPG (97.5 KB, 125 views)
File Type: jpg Snail unglued II (total).JPG (90.2 KB, 142 views)
File Type: jpg Speaker Rods.JPG (49.9 KB, 123 views)
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Old 15th January 2018, 02:17 AM   #2366
colinegreen is offline colinegreen  United States
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I have also been considering a bolt together assembly as opposed to the "you only get one chance" glue approach. Please let us know any ups / downs of this and if you are glad you did it instead of permanent glue.
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Old 15th January 2018, 09:34 AM   #2367
Doctor Why is offline Doctor Why  Germany
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Hi Guys,

@ Colingreen:

Due to the high weights and the resulting shear Forces, this question does not arise for me at all. At a certain Point in the Construction of such massive Objects you have to build uncompromising.

I insert the eight M16 threaded Rods to
1. to generate the necessary contact Pressure for the Glue (with the help of eight M8 threaded Rods)
2. to stabilize and stiffen the whole Part by pressing Pressure
3. to create a stable Suspension Point.
4. The M16 threaded Rods should also serve as a Backup if the Adhesive Joints fail and the part of the wall want to fall ...
5. ...

The total adhesive Surface is about 2800 cm² per plate. The minimum required pressing Pressure for this Area is 43 kN (4.3 tons).
One should not rely on the adhesive Force of the Glue in this part alone. At least I would not do it - hence the thick threaded Rods.


D.W.
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Old 23rd January 2018, 03:34 PM   #2368
Doctor Why is offline Doctor Why  Germany
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Geez...

Today times all the stuff provisionally screwed together (still nothing is glued!) And a chassis connected. Amplifier and an old laptop on it and run some music:

OH MY GOD...

My face, that's going to be a wrecking Ball !
Despite the fact that the horn is too mismatched - the wall is missing, a chassis is missing, a horn mouth opening is totally closed and the whole thing is still leaking - surprisingly very clean bass came out. Powerful and deeper than the Titanic ...
And completely horn typical as well as sneaky.
Purely heard it goes to well below 30 hertz with little level drop, only below 25 hertz, it can then be ...

Speaking of level: 2.8 volts at 32 hertz (measured on the chassis) have made the whole room shake, tools are rattled from the workbench and everything that was not fixed has moved ... And then this incredible pressure in the room, crazy ,
The membrane of the chassis did not move visibly.

Music was very well contoured and clean, without much resonance. But, as seen in the Simu, 70 Hertz is over - here is a fat peak to hear. Anyway, I wanted to separate at about 45-50 Hz steeply anyway, so this peak is irrelevant.

The next few days come in a few additional threaded rods and then the whole Monster is properly glued. Just 5 kilos of glue are available for that.


D.W.
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Old 23rd January 2018, 04:24 PM   #2369
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Quote:
OH MY GOD...
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Old 23rd January 2018, 09:17 PM   #2370
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Congrats on first sound Dr Why!


It’s OMG moments like this that we live for
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