Anyone making Apogee bass panels?

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#181
C59B08A6-F9F2-4DE5-B5E2-536E957A556A.jpg

Just glued it up and a 24 hour dry time for the silicone to dry and then tuning the panel.

I ran a stretched fishing line underneath down the center of the magnets to keep the panel sag to a minimum while it drys
This equalizes it somewhat before you stretch it horizontally to keep it consistently straight.
 
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#185
Here is a hand written tuning procedure for the Diva speaker. I don´t remember where I found this. Probably the old Audioworld Straightwire forum. So in the case it is helpful to anyone here it is:
 

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#186
Samppo said:
RedAlert, that is correct with regard to tension. I just don't see a way of corrugating it correctly without removing the vertical bars. Was your pair on Ebay in Cyprus a few years ago?
Click to expand...

Yep, its the same pair. Let me explain a little more. If I only could figure out how to add photos in here (directly from my pc), it would be much easier. The damaged area is about 10-15cm high area from the bottom bar. And it's only 20cm wide in vertically on the middle of the membrane, so in both sides corrugation is ok. If I take off the upper bottom bar, perhaps using the tiny gap between the under bar and the membrane I could foist in a tool of some kind to fix the corrugation. Thinking for instance special modified wide pincers made just for this job. Maybe it's a very difficult task or even impossible, but we'll see...
 
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#187
AVWERK said:
View attachment 811064

Just glued it up and a 24 hour dry time for the silicone to dry and then tuning the panel.

I ran a stretched fishing line underneath down the center of the magnets to keep the panel sag to a minimum while it drys
This equalizes it somewhat before you stretch it horizontally to keep it consistently straight.
Click to expand...

BREATHTAKING! :up: I've also a Duetta pair, and ones bass membrane is destroyed (speaker fall and hit a chair). I bought those very cheap, one speaker is ok. I've years planned to make the new bass membrane myself, but been too lazy I guess. Now when I saw your work, I got new drive. Very good job indeed! Any possibility to get any hints…?
 
#195
There are 9 points regardless of OD.
I asked this question before ordering and the reason for getting the smallest rods

For Dacen on bass panels the bigger OD. might be good enough although not certain of the depth.
Since the bigger OD. spreads out the peaks per inch , I think you will not notice any difference on bass frequency’s. I would still go ahead and use them

The bigger rods will make for easier bearing choices and are more robust due to the bigger
diameters. They might be more accurate and consistent overall.

I am researching an even better way to corrugation and will let everyone know if it works out

Regards
David
 
#197
Dave, The rods I was looking at were 3/8" and had an OD of .650, I believe they were heavy duty, HD stands for. now if one went to the 1 1/4" OD with the same 9 spline, the corrugation would be a lot longer spacing far from stock, what clearance did you allow on depth of spline .010 as you would have about .003 to.004 for ribbon thickness. Thanks Al
Also , are you still using the silicone backed kapton?
 
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#198
Al, that HD version was’t available when I purchased mine and it apparently is the same ID
Just thicker wall material to get to 650” OD

Yes using the same siliconed adhesive Kapton

What ever outside diameter you use, you should make test pieces say 2 foot long with your cut traces to get a feel of the shrinkage so you will have a ballpark idea of how to stretch to reach centering of the magnet rows and how to determine cutting dimensions of your traces.
This is another difficult area to manipulate , the vertical spacing requirement ..,

Test pieces are important because you get a better feel and then just scale everything up.

The (ultimate ) way to perfect alignment would be to make your panels first, stretch vertically on a table and adjust the magnets to these dimensions

Regards
David
 
#200
If one has the old foil available, you should be able to use it as a guide, just flatten it on the big table to get rid of corrugations and measure all essential dimensions, like total height and space between cuts. Or are those measurements already somewhere to get (Graz has those, but I doubt he would tell😉)? I have Duetta, which needs a new bass, and now I'm seriously thinking to do it myself. Old foil is in pieces, but maybe I can get measurements from it, difficult but could be possible. I have Kapton without adhesive, any suggestions what adhesive to use or should I purchase Kapton with siliconed adhesive. When I'm at point to really starting the procedure, may I ask advices from you who have the essential knowledge. If I have understood it right, first you need a glass plate big enough, and foil would be attached to it using somekind of soaplotion. Then you let it dry long enough, then use template of somekind to handcut the foil. But what kind of knife? When the cuts are finished after several days I assume, the you gentle sand the foil, wipe it clean and paste Kapton over the foil. When all has dried you just use water? to release the finished foil as one piece from glass plate. I only need those main principles, when making those test foils you learn the specifics. I really appreciate all of you who are willing to share information about this matter. Thanks in advance.

Regards
-Anssi-
 
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