Smooth break-up

[Alex from Oz]

Originally Posted by InclinedPlane

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?

[InclinedPlane]

Oh! No, an idea only.I would love to build it, if I had access to a few $million of equipment!

[CLS]

Originally Posted by dantheman

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.

[CLS]

Originally Posted by Alex from Oz

....


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... )?

[dantheman]

Originally Posted by CLS

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:

11.25 off

22.5 off axis

33.75 off axis:

45 off axis


Hope that helps,

Dan

[thadman]

Originally Posted by InclinedPlane

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.

[CLS]

Ah! I remember it now. It's indeed brought up before: “Loading” of tweeters in large drivers Coaxes
(and the next)

Sorry

[dantheman]

Originally Posted by CLS

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

[Antripodean]

So maybe there is a place for the Fertin Acoustic 20ex Model 7 Field Coil Driver with no surround ...

[dantheman]

Originally Posted by Antripodean

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.



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

Dan