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Old 7th January 2010, 01:08 AM   #41
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Quote:
Originally Posted by InclinedPlane View Post
I think there might be. A surroundless driver, using 2 spiders; one above the top plate and one several inches below the back plate.
Do you have a link or is it just an idea?
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Old 7th January 2010, 01:18 AM   #42
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Oh! No, an idea only.I would love to build it, if I had access to a few $million of equipment!
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Old 7th January 2010, 01:27 AM   #43
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by dantheman View Post
Here's polars on the PE 12"WG combined with a 15" woofer:
....
Interesting, and thanks a lot for sharing

If you don't mind, I have some questions:

1. What's the driver working with the WG?
2. Any mods on the throat of WG (and/or the adaptor)?
3. Can you trace the causes of those 'glitches' around 8~11kHz?

I apologise if those have been brought up before.
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Old 7th January 2010, 01:31 AM   #44
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by Alex from Oz View Post
....


These are my cone treatment goals in order of importance:
1. Maximise cone to air energy transfer
2. Minimise the reflected energy within the cone
3. Maximise surround to air energy transfer
...
How can 1 & 3 above be done? Or the statements are limited to a certain condition (a certain range of frequency, amplitude, or the likes... )?
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Old 7th January 2010, 02:03 AM   #45
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Quote:
Originally Posted by CLS View Post
Interesting, and thanks a lot for sharing

If you don't mind, I have some questions:

1. What's the driver working with the WG?
2. Any mods on the throat of WG (and/or the adaptor)?
3. Can you trace the causes of those 'glitches' around 8~11kHz?

I apologise if those have been brought up before.
Your welcome!

1. Eminence ASD1001S
2. No, the throat needs work. It definitely doesn't match up well.
3. My guess is that #2 is the what's causing #3 After I fix the throat I'll know better. They may be inherent in the driver to some degree. It's hard for me to say b/c the other horns I've put it in are very rough.

Here's the same compression driver inside the same 15" woofer on it's coaxial horn on axis:
Click the image to open in full size.
11.25 off
Click the image to open in full size.
22.5 off axis
Click the image to open in full size.
33.75 off axis:
Click the image to open in full size.
45 off axis
Click the image to open in full size.

Hope that helps,

Dan
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Last edited by dantheman; 7th January 2010 at 02:11 AM. Reason: inc
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Old 7th January 2010, 03:21 AM   #46
thadman is offline thadman  United States
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Quote:
Originally Posted by InclinedPlane View Post
I think there might be. A surroundless driver, using 2 spiders; one above the top plate and one several inches below the back plate.
It would still serve the same function as the surround. The motion must reduce to zero somewhere.
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Old 7th January 2010, 04:09 AM   #47
CLS is offline CLS  Taiwan
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Ah! I remember it now. It's indeed brought up before: “Loading” of tweeters in large drivers Coaxes
(and the next)

Sorry
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Old 7th January 2010, 04:34 AM   #48
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Quote:
Originally Posted by CLS View Post
Ah! I remember it now. It's indeed brought up before: “Loading” of tweeters in large drivers Coaxes
(and the next)

Sorry
No worries. At least you didn't get it all messed up this time. Just teasing man. No hard feelings?

Dan
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Old 7th January 2010, 05:20 AM   #49
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So maybe there is a place for the Fertin Acoustic 20ex Model 7 Field Coil Driver with no surround ...
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Old 7th January 2010, 05:36 AM   #50
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Originally Posted by Antripodean View Post
So maybe there is a place for the Fertin Acoustic 20ex Model 7 Field Coil Driver with no surround ...
For $2200 each, it won't be my house.

Click the image to open in full size.

Very interesting concept however, but for now I'll stick with my problematic surrounds. Maybe this technology will trickle down some day.

Dan
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