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Ever think of building a Cornu Spiral horn? Now you can!
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Old 13th March 2017, 01:01 AM   #2281
YouAgain is offline YouAgain  United States
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I remember the Cronu Spiralhorns at ETF way back in 2003. I walked into the room with music playing and had to ask "where are the speakers". The guy that built them had nice silk art stretched across the fronts and it had me completely fooled since they were hanging on the wall like paintings. I asked to have some punchy music put on to see how well they play it and we had a room full of German, Dutch, Swiss and American guys up on our feet dancing to it. It was a fun moment. They are truly stealth speakers.
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Old 13th March 2017, 02:20 AM   #2282
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
The biggest ones I have made were 22in. Maybe it's time for a full size 28in or 30in one. I have some RS 40-1197's (FE103) that need a home.
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Old 13th March 2017, 03:33 AM   #2283
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
27" should be great for those X. How old are the 1197's? Ferrite or Alnico?
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Old 13th March 2017, 07:21 AM   #2284
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Cal Weldon View Post
27" should be great for those X. How old are the 1197's? Ferrite or Alnico?
I think these are ferrite, circa 1999 based on the stamped label on the back. They were new in box units that I got as a gift from Godzilla.

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Old 19th June 2017, 08:39 AM   #2285
petervr is offline petervr  New Zealand
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Default Kiwi Cornu update and a couple of questions

Firstly to say, that is now been almost four years since I built mine, and I still really enjoy them and play music through them pretty much every night. Amazing speakers.

I want to make them as artful and 'stealth' as possible and have decided to put a piece of thin MDF in front of them covered with digitally printed loudspeaker cloth. (see pic). This cover is the same size as the speakers (500mm x 500mm).

I now want to make some other front covers for them but make these about an inch wider on all sides so the speaker becomes even less visible than before and you really have to look at them side-on to realize that they are speakers and not paintings/art prints. Do you think that making the front cover wider will impact on the sound quality?

Second question: to get them up against the wall as closely as possible (and still have a pro finished look) I want to fit my next set with some cup shape speaker terminals (as per pics). They will protrude about 15 mm into the driver cavity and there will be a gap of 10 mm between them and the back of the VIFA driver (which protrudes about 35mm into the cavity). Any impact on sound? and if so, what can I do about it to remedy it?
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File Type: jpg P70409-181211.jpg (543.0 KB, 238 views)
File Type: jpg speaker terminal1.jpg (208.2 KB, 238 views)
File Type: jpg speaker terminal2.jpg (233.8 KB, 114 views)
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Old 19th June 2017, 02:03 PM   #2286
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
I think the extension of the baffle will make them sound better as you're really just extending the length of the horns. As far as the terminal goes, what percentage of the driver chamber are you using up? If it 10% or less, can't see that as a problem. Also consider than the best terminal is no terminal so if you can live with it as is...
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Old 19th June 2017, 02:32 PM   #2287
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
I agree with Cal, but if the cup is not taking up significant room, should not be a problem. Maybe glue a piece of felt padding to cover the hard plastic cup to reduce the back reflection. Looks very nice. You could even put a wooden painting frame around it and no one will know it is a speaker.

Is this the actual speaker?

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Old 20th June 2017, 01:49 AM   #2288
gary3 is offline gary3  United States
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https://www.contrado.com/digital-speaker-cloth-printing

Looks like a slick way to do it.
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Old 20th June 2017, 07:17 PM   #2289
Cal Weldon is offline Cal Weldon  Canada
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Quote:
Originally Posted by xrk971 View Post
Is this the actual speaker?
Not meaning to talk out of line here but if you look at his second pic, you can see that those are indeed the speakers. I like the idea of using the picture frame, I have though about it myself. I liked the moulding on the 27" units I built but I think a picture frame would set it off that much nicer.
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Old 23rd June 2017, 02:55 AM   #2290
scott68 is offline scott68  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Default Is a cornu design a variant of a T-line?

It seems to me that a t-line and a cornu are similar.I have started a "compact T-Line" thread on the Full Range forum and If you think so, I would like to point to this forum if you'll think it is appropriate. I have downloaded the template and printed/taped several sheets together to use a foam core frame and 3/16" heated/bendable PVC strips.

Questions:
1. In a T-line you have some harmonics/ripples that can be made smaller by putting the driver about 1/3 of the way down the tunnel: Does a cornu design need that?
2. I noticed that a cornu has four tunnels. Are they tuned to different frequencies which I would think, is a better design than a T-line - is that correct?
3. Driver: Is the best to have a driver around 80 fs and low vas?
Thanks
scott

Last edited by scott68; 23rd June 2017 at 03:01 AM.
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