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Old 27th April 2013, 11:06 AM   #271
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Join Date: Dec 2008
Solhaga ,you are right about my aim.
I use my stereo/surround in a living room and dont want sweet spot there.In my workshop
I can use sweetspot settings.I still have a pair of magnetostats in my workshop.
I think if you make the speaker too direktiv you get higher level above midrange.
It might sound impressive,but not linear.

Bernt
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Old 27th April 2013, 12:16 PM   #272
solhaga is offline solhaga  Sweden
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Location: Värsta Götaland
Quote:
you get higher level above midrange
Yes, that´s why I EQ that part if need arises.

How do you measure the dispersion, moving the microphone or just listening?
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Old 29th April 2013, 10:43 AM   #273
ondesx is offline ondesx  France
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Join Date: Apr 2008
Default To Bernt...

Hello Bernt,

Perhaps this is another easier and probably lighter way to design an AMT diaphragm... These guys are using Graphene as conductors. This will be the thinner way to trace conductors whatever the design !

Here you have a few links to this method...

http://arxiv.org/pdf/1303.2391v1.pdf

Robert Murray-Smith - YouTube

https://www.smashwords.com/books/view/304668

My Best,
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Old 29th April 2013, 08:49 PM   #274
ondesx is offline ondesx  France
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Default To RayCtech

Hi Dude,

Any chance this time to see one of your Wide Range Heils ?

If they aren't produced yet by a company why don't share your skills with us ?

My Very Best,
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Old 20th May 2013, 08:55 AM   #275
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Here an other model:
[IMG]Click the image to open in full size.[/IMG]
It is angeled 10'
[IMG]Click the image to open in full size.[/IMG]
Dispertion is right for me.Sound too.I am crossing at 1000hz. 48 db.Might try lower.
These ones I am going to keep for a while.

Measurements later.

Bernt
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Old 20th May 2013, 09:21 AM   #276
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Location: Multiple...
Quote:
Originally Posted by ondesx View Post
Hi Dude,

Any chance this time to see one of your Wide Range Heils ?

If they aren't produced yet by a company why don't share your skills with us ?

My Very Best,
My new music room are finished in a weeks time from now and then they can be both viewed and listened to..
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Old 20th May 2013, 12:00 PM   #277
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Measurements on axis at 1 meter 2.8v.:
[IMG]Click the image to open in full size.[/IMG]
Is it possibly to post REW files.

Bernt
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Old 21st May 2013, 12:58 PM   #278
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Your work has come a long way - a real achievement! It's been a pleasure following this thread.

I've finally started on my diaphragm tests (yay!) using kapton. Still experimenting for the best way of cutting the Al without tears (both meanings of the word).

@Ray - are your diaphragms also made via manual cutting, or did you etch the traces?

Tomorrow I'm hoping to find some appropriate metal for a folding jig.
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Old 21st May 2013, 03:00 PM   #279
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What is the thicknes of the capton , and is it selfadhesive ?

Bernt
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Old 22nd May 2013, 01:29 AM   #280
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The tape that I have is 1 mil + glue, so about 2 mil total thickness, I believe. I bought it for 6 EUR from ebay for a roll of 50 mm tape. It was easier/cheaper for me to source than the 3m 74 tape and makes for good first experiments at the very least. Beyma and a few other brands are using kapton, I think. Also my Fostex headphones (planar) use kapton. The temperature resistance will be good, at the very least.

The glue dissolves without a problem. I have made some small diaphragms, but need to make the folding tool to give them a try. I will start at 50 mm and work my way up.

I will probably end up using oversized diaphragms with only the middle exposed, using the rest like a suspension to lower the resonant frequency and avoid boundary effects. Hopefully they will be suitable for the mouth of a Synergy horn, eventually.
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