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Suitability of Alpair 10M Gen 3 For Front Loaded Horn
Suitability of Alpair 10M Gen 3 For Front Loaded Horn
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Old 30th August 2018, 05:57 PM   #41
tapestryofsound is offline tapestryofsound  Scotland
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Join Date: Jul 2017
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Originally Posted by GM View Post
FWIW, my understanding is that it's an OB until it's folded up enough to acoustically load it within its pass-band [Fhm = 2*Fs/Qts'], so must be pretty big to load a high Qts' driver even once the room's boundaries are accounted for. GM
Thank you for the reminder, I really do like these really big front loaded horns. Busy doing other things right now with visuals, and thinking about my next speaker build this winter, somewhere along the lines of maybe 6ft x 3ft x 6ft with no speaker cabinet ......
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Old 18th June 2019, 08:57 PM   #42
tapestryofsound is offline tapestryofsound  Scotland
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Been very busy over the last year with various creative art projects, as well as health care giving duties, and during the Spring finally started work on a pair of swan necked front loaded Tractrix horn speakers. These are to give additional stereo information to what is now a much listened to 4ft wide LeCleach horn, using 3inch Peerless 830987 full range speakers. The spec is (allegedly!) 50hz to 18khz, but around 200hz and upwards with a generous overlap with the LeCleach will do me fine.

It has been quite a difficult build so far. Modelling in HornResp until I came up with something realistic took some doing when the enclosure size is just one litre. This time, I have chosen to build a set of formers to cover in paper mache in order to get a swan neck curve, and to say the least, it has not been easy. I have had to employ ‘Cathedral type thinking’ from the get-go. The idea is to use guy ropes made of trimmer wire to pull and hold together what is still a wobbly edifice of cardboard, and although it all appears to be working, and I am learning a great deal ...... I won’t be doing it the same way next time!

Here is a nice picture of the build so far. ToS
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Old 19th June 2019, 03:56 AM   #43
pcgab is offline pcgab  United States
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Join Date: Dec 2014
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Suitability of Alpair 10M Gen 3 For Front Loaded Horn
Fascinating endeavor and looks like excellent craftsmanship thus far. Have you seen John Inlow's website(1)?

On his 15a page, and likely others you can see his approach to layered horn building. You can see in the picture of the horn half molds that he uses expanding foam between the 'ribs' of the mold so he can then cover in, what looks like plaster, then likely paints it with something to help the layered molded pieces release. He might discuss this on his paper mache horn pages as well.

It could be of some use to you as a potential stiffener for the ribs in your molds.

Cheers,
Gable


1 - inlowsound.com
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Old 19th June 2019, 05:40 AM   #44
tapestryofsound is offline tapestryofsound  Scotland
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Join Date: Jul 2017
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Originally Posted by pcgab View Post
Fascinating endeavor and looks like excellent craftsmanship thus far. Have you seen John Inlow's website(1)?

On his 15a page, and likely others you can see his approach to layered horn building. You can see in the picture of the horn half molds that he uses expanding foam between the 'ribs' of the mold so he can then cover in, what looks like plaster, then likely paints it with something to help the layered molded pieces release. He might discuss this on his paper mache horn pages as well.

It could be of some use to you as a potential stiffener for the ribs in your molds.

Cheers,
Gable


1 - inlowsound.com
Gable,

I am a huge fan of John Inlow, a very ingenious man, and have studied his work in depth. His varied use of materials is simply brilliant. There is something within me that refuses to verbatim copy other people, as I believe it to be unfair. What he does is what he does, and what I do is what I do. Nevertheless, I find his dedication very inspiring, as he has proved to me that it is possible to work entirely with recycled paper products alone.

I like to see the limitations that I have imposed upon myself as a spur to invention. Rather than make horn speakers as massively heavy immovable objects, I have gone the opposite way, and see horns as lightweight musical instruments in their own right, with timbre and colouration of sound that enhances the playback of music - or that is the theory!

At the moment, I am making it all up as I go along. Each success, and each mistake shows the way to the next step. It is very exciting making musical sculptures in this way, and I love the whole process of working slowly and carefully in pursuit of excellence.

ToS
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Old 19th June 2019, 04:29 PM   #45
pcgab is offline pcgab  United States
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Join Date: Dec 2014
Location: San Marcos, Texas
Suitability of Alpair 10M Gen 3 For Front Loaded Horn
I often limit myself to specific tools, or try to solve things without google. I've found that discipline in this method can lead to great leaps of learning and understanding.

It does tend to lead to some frustration, and mistakes, but that's part of the benefit, IMO.

If I've read correctly thus far, you are going to use your big le'cleach horn for ~50-250hZ coverage and the in process goose-neck horns for ~200hZ and up?

I may need to go back and re-read the thread to confirm that. Was a bit curious if you had plans to try to cover lower frequencies than ~50hZ?

I am enjoying following your progress, your dedication, creative designing and building have made this a fascinating project to follow.

Cheers,
Gable
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Old 19th June 2019, 05:06 PM   #46
tapestryofsound is offline tapestryofsound  Scotland
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Join Date: Jul 2017
Quote:
Originally Posted by pcgab View Post
I often limit myself to specific tools, or try to solve things without google. I've found that discipline in this method can lead to great leaps of learning and understanding.

It does tend to lead to some frustration, and mistakes, but that's part of the benefit, IMO.

If I've read correctly thus far, you are going to use your big le'cleach horn for ~50-250hZ coverage and the in process goose-neck horns for ~200hZ and up?

I may need to go back and re-read the thread to confirm that. Was a bit curious if you had plans to try to cover lower frequencies than ~50hZ?

I am enjoying following your progress, your dedication, creative designing and building have made this a fascinating project to follow.

Cheers,
Gable
Gable,

Glad that you are enjoying the build. Yes, the limitations we impose upon ourselves can be frustrating, but I have come to believe in the principal of ‘le grande tour pour la cul de sac’ - if you come to a dead end, at least you know the way back, and on the way back it becomes immediately obvious what is the right way forward. Works for me, as solutions often come about by doing things either never thought of or done before.

At present, the LeCleach is fitted with a 6.5in alnico guitar speaker, and with eq, it gives a fairly good impression of bass, mids and treble, and is at its best between upper bass and mid treble. The horn is incredibly efficient due to its size, the amp is under run, and so gives quite a good musical account of itself.

But I want the treble frequencies to articulate stereo information, and so I am building the smaller Tractrix horns.

The bass comes next, and I am thinking of a 10” Eminence BP10-4ohm in a tube firing upwards underneath the small table the LeCleach sits on. I don’t need a massive bass sound, just enough to compliment the projected soundscape.

At first, I shall see what I will be able to do with signal splitters and guitar pedals to eq and time delay the sound, but I reckon the real way to go is a miniDSP 2x4 HD with two channels for stereo, and two dedicated mono channels for the LeCleach and bass. If it all makes me want to get up and sing and dance, then I will have succeeded.

ToS
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