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Old 29th March 2013, 03:00 PM   #11
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Originally Posted by WrineX View Post
i was wondering if there was enough interest to create of the shelf panels. with Pcb as stator material. with slots or drilled holes.

i might get me a plate of 1 mm thick 51 cm x 115 and cut some prototypes. in like 10 x 25 cm panels ? for mid and high frequency's ? with some support dots for the foil they could reach down to 300 hz with some efficiency to.
If you build them, and I can follow along, I think a pair of those would be great for the mids and up with a little 8w tube amp I built. Then I would have a NEED to use an 8" kevlar sub that has been laying around begging for some class D power. Sure would be convenient to use PCB if it works.
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Old 29th March 2013, 03:47 PM   #12
WrineX is offline WrineX  Netherlands
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yeah im thinking of using 0.5 mm pcb board backed with 9 mm thick louvre roster (eggcrate) on one side where the mebrane will be glued on to not let it warp as easy. im still not sure about using slots or holes. anyone has ideas on that department? is welcome. Dc spacing will, be 1mm.
with slots i can easy putt the slots between the squares of the louvre(eggrcrate)...

when i sold my magnepan 1d's and some other loudspeakers i have standing around i will look into it right away!.
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Old 29th March 2013, 05:14 PM   #13
Bazukaz is offline Bazukaz  Lithuania
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Hi,

If egg crates are going to be used why not take an advantage of building a wire stator?

1) It does not arc
2) Not difficult to build
3) Dispersion control is relatively straightforward.

Here is an example of small esl test stator, measuring 15x58 cm.

Regards,
Lukas.
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File Type: jpg Small ESL photo.jpg (99.8 KB, 89 views)
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Old 29th March 2013, 05:19 PM   #14
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I knew I saved that eggcrate for something! Will definitely look into the wire stator approach. At this point I would just be happy to get one panel going for AM/SW/SCANNER radio.
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Old 29th March 2013, 05:30 PM   #15
WrineX is offline WrineX  Netherlands
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yep that one is always possible reinventing acoustat
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Old 29th March 2013, 05:35 PM   #16
Bazukaz is offline Bazukaz  Lithuania
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Quote:
Originally Posted by MeTarzan View Post
I knew I saved that eggcrate for something! Will definitely look into the wire stator approach. At this point I would just be happy to get one panel going for AM/SW/SCANNER radio.
You will need to figure out how to stretch wires.
Some people build stretching jigs. IMO for a first panel nothing too sophisticated is required.
Pulling by hands is not going to work well to straighten them.
A pair of treaded rods can be used to wrap the wires around. Two stators are inserted inside between before doing this. After that threaded rods are pulled apart with high force(lets say some hooks , etc).
The next step is finding suitable glue to bond wires to egg crate, by appliying on top of them. A syringe works well.
It may not be as simple as it seems. Super glue works but unfortunately wire insulation is attacked and compromised, so something else can be experimented with.
One good approach is to make glue yourself by dissolving the same egg crate material in methylene chloride. It will melt into the plastic but does not attack PVC insulation.
I suggest you search for more information, there are a lot of posts about wire stators here.

Hope this helps.
Lukas.
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Old 29th March 2013, 05:42 PM   #17
Bazukaz is offline Bazukaz  Lithuania
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Originally Posted by WrineX View Post
yep that one is always possible reinventing acoustat
There is so much info about acoustats over here that we have nothing left to reinvent
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Old 29th March 2013, 05:46 PM   #18
WrineX is offline WrineX  Netherlands
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welll the egg crate melting and the wires are all aucoustat way. the melting is prob even more dificult then just glue i guess by the way you use solid copper wire? or flexible. made a stretch jig once for solid wire in the hope i could stretch it so hard the copper stays in the need straight position.. this need some major brute force i must say. rather gone look for some smaller solid core wire this will help doing that. then just apply the glue to all the wires with a brush and jamm the eggcrate on it wait to set and remove all from the frame.
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Old 29th March 2013, 05:50 PM   #19
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For this small size I would think a simple loom/jig with proper spaced pegs/screws/nails would work. I like the idea of using the grooves in a threaded screw. Tensioning would be easier that way too I would think. After finally getting my mind around the innertube stretcher I have to change gears...
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Old 29th March 2013, 06:07 PM   #20
Bazukaz is offline Bazukaz  Lithuania
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Quote:
Originally Posted by WrineX View Post
welll the egg crate melting and the wires are all aucoustat way. the melting is prob even more dificult then just glue i guess by the way you use solid copper wire? or flexible. made a stretch jig once for solid wire in the hope i could stretch it so hard the copper stays in the need straight position.. this need some major brute force i must say. rather gone look for some smaller solid core wire this will help doing that. then just apply the glue to all the wires with a brush and jamm the eggcrate on it wait to set and remove all from the frame.
In the current example seen in photo I used flexible wire with outer diameter of 1mm, insulated with PVC. Solid core with PVC insulation is very much preferred as it does not lose shape over time. Heavy stretching force is required for so many wires, and all should be stretched into plastic deformation.
I have tried to use the same method of gluing like acoustat did, by applying molten egg crate material. It was not difficult at all. Resulted in much better bond compared to several glues I have tried. It encapsulated wires well, sagging into the egg crate was minimal. These stators had been stored in horrible conditions for a few years and I could not find any wire detached.

Last edited by Bazukaz; 29th March 2013 at 06:09 PM.
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