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Anyone making Apogee bass panels ?
Anyone making Apogee bass panels ?
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Old 21st November 2020, 02:56 AM   #271
AVWERK is offline AVWERK  United States
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Location: So Calif.
Nice to see someone going for it !

The 2 support wheel sections are better and will keep your panel straighter with less compensating to keep it aligned. I used silicone spray on the rollers and cleaned the panels with acetone on both sides thoroughly.

I noticed some of the anodizing is wearing thru. These rollers need constant cleaning attention so as to not transfer to your finished panel surface.

To get to 6 ohms you would need twice the voice coil length than a Diva panel so the assumption is your adding more turns or tighter spacing specs with neo magnets or much thinner foil ?


Regards
David
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Old 21st November 2020, 08:47 AM   #272
Blues ea is offline Blues ea  Finland
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Hey.
I have calculated that I can take on that film 56m 15mm wide conductor. At 25 Micron it would be about 4 ohms and at 20 Micron it would be about 6.5 ohms. The conductor should be the entire width of the surface of the film from start to finish, i.e. it is 500mm. thus the height of the panel remains within some limits. at these values the film would be about 1800mm high. Magnets that I have ordered are 50x3x8mm N52 neodymium. the magnets come at 16mm intervals measured from the center. 15mm conductor and 1mm blank 15mm conductor ......
the surface of the corrugator rollers is completely intact. that light spots in the picture are due to when I rotated it blank. those leave when you wipe them.
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Old 27th November 2020, 09:56 PM   #273
AVWERK is offline AVWERK  United States
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11257840-8082-4DBB-BC9F-3E904FA75C00.jpg

After preliminary tuning and driving it at 100db (c) scale at 20 hz what I find interesting is if you put your hands along the joint where the movable tuning foil section is and the solid frame exsist , you can feel it moving around suggesting a bigger dia. grommet would have better than the one they used.
Will drive it hard for awhile and recheck tuning points to see if it’s drifting around

Music signals will not be an issue but it is there however

After a couple of hours my Krell 100 mono clone hasn’t let the smoke out - yet -

Regards
David

Last edited by AVWERK; 27th November 2020 at 10:19 PM.
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Old 28th November 2020, 05:44 AM   #274
narkotic is offline narkotic  United States
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Having too much fun man!
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Old 28th November 2020, 09:29 AM   #275
Blues ea is offline Blues ea  Finland
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I've been thinking about that same thing, and I've been sure it's moving. It's a good thing it's also been found in In the right tests. I've been thinking that after the tuning. We should be able to lock that up. In that case, the flexibility of those adjusting screws will be lost��Those fastening screws that now allow that move should be able to tighten the panel from the back side I'm trying to come up with some solution to this. Great job again AWERK
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Old 28th November 2020, 09:40 AM   #276
taotao is offline taotao  Germany
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Default Tightening rubber gromets

I too asked myself, if it‘s possible to screw the moveable wooden bar onto the underlaying board (After Tuning).
I guess they did it (rubber gromets) to compensate the membran changes due to temperature changes.

Regards
Olaf
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Old 29th November 2020, 07:02 PM   #277
AVWERK is offline AVWERK  United States
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77D26B49-E9FA-406F-8509-1B05C7CDE7B5.jpg

It’s easy to check if solid clamping would result in a better outcome.
I got amplitude swings especially at the lowest tuning freq. ( 32 hz )
More uniform overall the factory way IMO

If you were to rigidly clamp the tuning strip, over time your tuning frequency’s would change with foil wear / movement

If you want consistant tension over time in all conditions it would be best to leave the slight movement afforded by the tightened down grommets under
constant spring tension

They did this way for a reason..,.

FWIW
Break in the foil for a few hours before starting tune

The ( Scintilla only ) has 5 tuning targets

32 hz -6” up from the horiz. clamp strip
47 hz- 6” down from the horiz. clamp strip
39.5 hz - mid point dim. (From top & bottom frequency’s)

Between those 2 areas equal spacing again
35.75 hz lower mid
43.25 hz upper mid

You are tuning for the highest amplitude peak at each frequency
Sweep up & db under power after tightening grommets

(Yes Pete, we are having fun !)

Regards
David
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Old 29th November 2020, 07:57 PM   #278
narkotic is offline narkotic  United States
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Quote:
Originally Posted by AVWERK View Post



(Yes Pete, we are having fun !)

Regards
David
I see that, I'm envious! Please have me over to see them when you have them playing music.
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Old 29th November 2020, 08:35 PM   #279
Blues ea is offline Blues ea  Finland
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Hi.
Of those springs that are in those tightening screws. Is there any more detailed information on them. Spring length, wire thickness outer dimension. the force of the spring. In fact, I thought springs the following values.
wire thickness 1,50(mm)
outside dimension 12,00(mm )
inside diameter 9,00(mm)
Unloaded length 22,00(mm) 22,00
Maximum loaded length 11,8(mm)
Maximum mobility 10,20(mm)
Maximum load along the length 90,87 (N)
Spring constant 8,9 (N/mm)
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Old 13th December 2020, 04:03 PM   #280
AVWERK is offline AVWERK  United States
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3C6A6015-B49E-496B-A160-DEA9D1ADFD64.jpg

Another tip that made a significant difference was to place a rolled up poster at the exit of your foil.
You might even place it above the exit line height even though I kept it parallel on these 2 Scintilla panels

Without it the exiting crease tends to make cupping down ripples that require more vertical stretching to remove.

You will find the panel lays much flatter before you start your install

Regards
David
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