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Old 22nd November 2010, 07:49 PM   #101
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Quote:
Originally Posted by epa View Post
2 cressendo have you seen post 90 ?
Yeah, and I liked the fact that post 73 had more response at 30Hz. And I also realized (after I posted my request to you guys) that post 73 was flatter to 30Hz than the one I modded. Even tho my modded cab had more output, it jumps 4dB from 30 to 40Hz - where as yours only jumps ~2dB. I really would like flatter to 30Hz with the most output as well. So, sorry for puttin in that request prematurely.

73 remains my fave (size & output at 30Hz - bein flat from 30Hz). Is there an easier way to fold it?

If not, could you send me those details, epa?


Again, many, many thanks to you talented individuals!!


Justin
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Old 23rd November 2010, 10:16 AM   #102
Xoc1 is online now Xoc1  United Kingdom
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Post 73 (Epa) @ 2.83V
30Hz = 95.28 dB
40Hz = 98.58 dB
3.3 dB difference

Post 98 (Xoc1) @ 2.83V
30Hz = 96.17 dB
40Hz = 100.74dB
4.57 dB difference, so step from 30 to 40 Hz is 1.27 dB more...
Post 98 is more efficient at both frequencies as would be expected as it is bigger. External is 600 litres compared to 397 for post 73.
Biggest misgiving I have about the post 73 design is the small S3 dimension.
At 1236 this is about the same size as SD. You can see how tight the mouth is positioned to the rear of the driver. This would require care and adjustment to make it work due to the driver seriously restricting the mouth. I suppose an access panel would be needed to actually get the driver in the box!
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Old 23rd November 2010, 04:50 PM   #103
epa is offline epa  Netherlands
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Quote:
Originally Posted by Xoc1 View Post
Post 73 (Epa) @ 2.83V
30Hz = 95.28 dB
40Hz = 98.58 dB
3.3 dB difference

Post 98 (Xoc1) @ 2.83V
30Hz = 96.17 dB
40Hz = 100.74dB
4.57 dB difference, so step from 30 to 40 Hz is 1.27 dB more...
Post 98 is more efficient at both frequencies as would be expected as it is bigger. External is 600 litres compared to 397 for post 73.
Biggest misgiving I have about the post 73 design is the small S3 dimension.
At 1236 this is about the same size as SD. You can see how tight the mouth is positioned to the rear of the driver. This would require care and adjustment to make it work due to the driver seriously restricting the mouth. I suppose an access panel would be needed to actually get the driver in the box!
restriction is not to bad because of the neodinium magnet.
Click the image to open in full size.
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Old 23rd November 2010, 05:10 PM   #104
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Quote:
Originally Posted by epa View Post
restriction is not to bad because of the neodinium magnet.
Click the image to open in full size.

You could design it so that the entire front panel (or a major part of it) is removeable. Not only will that give you full access to the driver, it will also allow you to play around with the mouth's geometry without having to hack away at any fixed panels.
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Old 23rd November 2010, 05:13 PM   #105
epa is offline epa  Netherlands
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Quote:
Originally Posted by CRESCENDO View Post
Yeah, and I liked the fact that post 73 had more response at 30Hz. And I also realized (after I posted my request to you guys) that post 73 was flatter to 30Hz than the one I modded. Even tho my modded cab had more output, it jumps 4dB from 30 to 40Hz - where as yours only jumps ~2dB. I really would like flatter to 30Hz with the most output as well. So, sorry for puttin in that request prematurely.

73 remains my fave (size & output at 30Hz - bein flat from 30Hz). Is there an easier way to fold it?

If not, could you send me those details, epa?


Again, many, many thanks to you talented individuals!!


Justin
i designed the post 73 th for the use in a cardroid sub aray.
this is why its symetric.
i like xco1 model 2,its a easier bild but for me a little to big.

i wil work this weekend on it to give you al the details
meanwile here are some designs,most of them are posted here.to make your choice more diffecultClick the image to open in full size.
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Old 23rd November 2010, 05:26 PM   #106
epa is offline epa  Netherlands
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Quote:
Originally Posted by Brian Steele View Post
You could design it so that the entire front panel (or a major part of it) is removeable. Not only will that give you full access to the driver, it will also allow you to play around with the mouth's geometry without having to hack away at any fixed panels.
yes the idea was to make the front parts removeble

Last edited by epa; 23rd November 2010 at 05:42 PM.
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Old 25th November 2010, 04:15 PM   #107
epa is offline epa  Netherlands
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@justin
what material do you want to use ,i srongly sugest birch plywood,but i cant look in your wallet
do you want to make it 12 or 15mm .
i need 2 now before i start working on it
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Old 25th November 2010, 11:32 PM   #108
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Quote:
Originally Posted by epa View Post
@justin
what material do you want to use ,i srongly sugest birch plywood,but i cant look in your wallet

do you want to make it 12 or 15mm .
i need 2 now before i start working on it
Yeah, I use birch. At least 15mm. You don't think 12mm will have too much flex, even w/bracing? I'd rather be safer than sorry. Thanks a ton (again).


Justin
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Old 26th November 2010, 11:43 AM   #109
epa is offline epa  Netherlands
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ok lets make it 15mm.i think 18 is a bit over the top.
horizontal there are only small spaces ,and vertical wil do some bracing in the middle.
front wil be removeble in one piece.
it might be a good idee to send you the dwg,dxf file when im finnished.
then you can make a 1 on 1 print on A0 paper(it fits)in the copy store.
cost about 4 euro here on this side of the pond
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Old 26th November 2010, 01:40 PM   #110
epa is offline epa  Netherlands
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justin ,we need to make a new topic,because this has no longer anything to do with woodys design ,
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