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Old 18th May 2012, 07:06 PM   #1
turner is offline turner  Germany
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Default Scan Sphere Project

Hi guys,

after a long time without any diy audio project I felt the strong desire to create some new speakers for my desk

My last project was far bigger than this one (almost as tall as I am) - this time it is going to get a little bit smaller.

Since I never had a fullrange system in place, I thought of giving this type of speakers a chance. The other thing I really wanted to do for a long time was to build a sphere speaker.

After some research in the latest diy hifi magazines and the common diy audio forums, I decided to choose the Scan Speak 10F. I gathered a pair of almost new ones on ebay for a reasonable price. I also fell in love with a pair of sphere speakers from the sixties made by Telefunken - used to be a great brand in Germany in the last century.

So it happens that the name of my new project is Scan Sphere!

I know, some of you might consider modifying this old Telefunken speaker sacrilege. I have no scruples implanting new life in this bowls. The next picture shows how they look like:

Click the image to open in full size.

They come on a very nice stand made of acryl glas.

The next pictures shows the 10F in front of the Telefunken speaker. The 10F seems quite tiny.

Click the image to open in full size.

Now to my problem: I designed two ways of integrating the 10F in the sphere:

Click the image to open in full size.

The first idea was to install the 10F similar to the way the old driver was installed. I would prepare some kind of waveguide in front of the driver. This version has the big advantage that the design of the speaker will not be changed. I also can use a cloth cover in front.

The second idea was to install the 10F as part of the sphere. This would possibly generate the best results regarding baffle distortions. The required flange could be made of (black) MDF or massive wood - up to one's own taste.

Do you see any disadvantages or show stoppers in my versions? Which one would you prefer? Classic look or perfect sphere?

Any comments are welcome ...

so long
Turner
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Old 18th May 2012, 08:00 PM   #2
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I vote for second version!

and upload pictures here: TinyPic - Free Image Hosting, Photo Sharing & Video Hosting and then copy-paste IMG Code for Forums...
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Old 18th May 2012, 08:28 PM   #3
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by turner View Post
The first idea was to install the 10F similar to the way the old driver was installed. I would prepare some kind of waveguide in front of the driver. This version has the big advantage that the design of the speaker will not be changed. I also can use a cloth cover in front.
I vote for this version. You want to keep the back of the 10F as open as possible. Especially to the sides. I don't see how you can achieve that for the second version without adding a subframe.
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Originally Posted by DYNABLASTERTUNERS View Post
and upload pictures here ...
Definitely not. There is a nice attachment management in this forum. You just have to learn how to use it.
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Old 19th May 2012, 07:47 AM   #4
turner is offline turner  Germany
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@Rudolf: why is it so important to keep the back of the 10F as open as possible? Do you think this has more effekt than the baffle on the outside?

Has someone an idea how I can get off the cloth from the front cover without damaging it? It is clued to a wooden ring. Since I cannot find a suitable cloth somewhere in the diy audio stores that looks nowhere near enough, I though about re-using the old cloth.

Click the image to open in full size.

so long
Turner
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Old 19th May 2012, 08:01 AM   #5
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nicd project, quite akin to the ikea bowl spheres that others have built, and i intend on trying at the next chance i get, using either alpair 5 or tangband 3". The mounting of the driver is my only stumbling block, but good venting to the rear of the driver is a good suggestion, as is a smooth transition from front to the sphere. I cant think of any better ideas than u have already ill keep my thinking cap on though
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Last edited by mondogenerator; 19th May 2012 at 08:07 AM.
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Old 19th May 2012, 08:07 AM   #6
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Mondo , I like your new signature !
A wardrobe is so.....amagnetic !
Ps. But there are still some interactions-attraction between them !
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Old 19th May 2012, 10:34 AM   #7
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Have a look at the Ikea bowl spere thread for build hints.

The Ikea bowls are not perfect half spheres, so you choose this route, you should add a piece of 20mm (or thereabouts) ply between the two halves, which gives you an oportunity to add some bracing.
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Old 19th May 2012, 10:37 AM   #8
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Ikea spherical speakers, first build done.
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Old 28th May 2012, 11:58 AM   #9
turner is offline turner  Germany
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Click the image to open in full size.

Success! Front cloth could easily removed by putting the front cover in warm water with some soap for a couple of hours.
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Old 28th May 2012, 12:01 PM   #10
turner is offline turner  Germany
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Click the image to open in full size.

No, this is not the Large Hadron Collider at CERN but the new inside damping of the Scan Sphere speakers. It is called Hawaphon.
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