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Old 20th January 2013, 09:47 AM   #31
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I'm still waiting on my minidsp mic to take measurements.

Leif should hopefully have his walnut ones installed soon and able to give a 'review'.
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Old 10th February 2013, 02:50 PM   #32
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Interesting work.
I have gone from DIY 12 sided conicals in scandi birch ply, adding rounded mouth termination to tractrix for my 5 way project.
I am currently using Cube audio 600 Hz Tractrix on either JBL2435Be or Vitavox S2 drivers for my upper mid horns.

I would be interested in trying a JMLC profile in as soft a wood as possible. 550Hz or 600Hz 1.5" throat.
Perhaps balsa is too soft though
Throat is critical of course.
The S2's use a screw on adapter that I have made and fits the JBL (and others) 4 bolt PCD. Simple to drill and insert threaded bar int he horn base.

Other needs would be 200Hz tractrix horns in wood to replace the Autotech GRP ones I have, but at ~65cm dia these are too big for most lathes. Then there are the bass hyperbolics I have just lashed up - much too big.

JMLC just get too big for lower freqs in a 4 or 5 way config...

Last edited by Speedysteve7; 10th February 2013 at 02:55 PM.
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Old 10th February 2013, 04:53 PM   #33
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Hi Speedy Steve,

May I ask why you request as 'soft a wood as possible'?

Everything I make so far is bespoke and made to order.

I dreaming of buying or making a Union Graduate bowl turning lathe, with almost infinite turning capability.

My 'Hobby' Lathe tops out around 380mm Diameter over the bed, by 1.1m.
If I could make a stand to support the weight off the bed then much bigger things can be turned, provided the motor is up to it.

Some experiments need to happen...

I am drawing up some plans for a client for a 600Hz Traxtric which will be made from European Oak.

Keep in touch.

Louis
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Old 10th February 2013, 07:22 PM   #34
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Soft as I want to try something different to the GRP - a well damped wood.

The Cube audio and Autotech horns are surprisingly solid in their construction but probably give a signature to the sound - hence trying different materials. Of course unless the exact same dims and profile is used I will never know...

I have a lathe that can swing 8" so could make Audio cube tractrix -likes at 7 & 5/8" to see. The actual horn length is 3 & 1/2".
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Old 10th February 2013, 08:04 PM   #35
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@ Speedy Steve
I do have some pine blanks, 2 small and 2 large, that I see no other use for...

What is your current set up, always nice to know.
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Old 11th February 2013, 06:03 AM   #36
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the nextel horns from Autotech are smoother sounding with no detectable signature
best
Leif
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Old 11th February 2013, 01:59 PM   #37
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5 way project - tapped, bass, mids and tweeter, big boy system

1st page for the starting point and evolution then the pics got lost on the rest of the journey until more recently where it is now see pages 10

5 way project - tapped, bass, mids and tweeter, big boy system

and current

5 way project - tapped, bass, mids and tweeter, big boy system

Constantly evolving and usually improving



Quote:
Originally Posted by Studio Au View Post
@ Speedy Steve
I do have some pine blanks, 2 small and 2 large, that I see no other use for...

What is your current set up, always nice to know.

Last edited by Speedysteve7; 11th February 2013 at 02:01 PM.
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