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BG NEO 3 FR optimization
BG NEO 3 FR optimization
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Old 27th July 2017, 06:11 PM   #11
lowmass is online now lowmass  United States
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Quote:
Originally Posted by atoluma View Post
no back up, free air!
Ok that likley explains the 2-5 khz wiggle

Interesting how the half round rods can smooth this AND I suspect from my own experaments that you DONT have the half rounds on the back side only on one side?
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Old 27th July 2017, 06:14 PM   #12
atoluma is offline atoluma  France
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As written, On both side!
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Old 27th July 2017, 06:17 PM   #13
lowmass is online now lowmass  United States
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Originally Posted by atoluma View Post
As written, On both side!
Ok interesting not what I thought.

How about the baffle ? what are you using?
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Old 27th July 2017, 07:40 PM   #14
Davey is offline Davey  United States
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Originally Posted by atoluma View Post
no back up, free air!
Okay, thanks for the clarification.

On my Neo3's, removing the back cup caused a severely under-damped response. I think because of your microphone distance you're probably not seeing it illustrated.

I'm not a fan of removing the back cup on those tweeters. They already have a significant resonant behavior and removing the back cup only accentuates the situation. Plus, distortion increases as well.
I consider the Neo3PDR a supertweeter only.

Nice experiment though.

Cheers,

Dave.
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Old 27th July 2017, 08:10 PM   #15
bolserst is offline bolserst  United States
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Quote:
Originally Posted by lowmass View Post
How about the baffle ? what are you using?
I could be wrong, but looking at the measurement in the first post, I'd wager they were near field measurements with the mike quite close to the driver.

A bit of deja vu here, as just last week I stumbled on the Audeze patent for what they call "fazor-elements" used in there planar headphones.
FAZOR ELEMENTS | Audeze
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File Type: png fazor.png (490.5 KB, 279 views)
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File Type: pdf US9258638B2.pdf (140.4 KB, 12 views)
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Old 27th July 2017, 08:31 PM   #16
atoluma is offline atoluma  France
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cool! It strengthens me in the idea that it is not really such a bad thing!

maybe i will try their "bullet" shape?
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Old 27th July 2017, 09:26 PM   #17
atoluma is offline atoluma  France
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Originally Posted by Davey View Post
I'm not a fan of removing the back cup on those tweeters. They already have a significant resonant behavior and removing the back cup only accentuates the situation. Plus, distortion increases as well.
Dave i'm very suprised about your distortion claim. I found the opposite and Troels too:

WITH BACK cup

Click the image to open in full size.

WITHOUT
Click the image to open in full size.


futhermore , remove the back cup lower the resonance frequency so I found it usufull to use this tweeter from 2khz. but maybe we don't talk about the same thing?

Last edited by atoluma; 27th July 2017 at 09:33 PM.
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Old 28th July 2017, 12:07 AM   #18
lowmass is online now lowmass  United States
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I would try the "bullet"

as well I would try a few wave guides with the bullets
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Old 28th July 2017, 12:13 AM   #19
lowmass is online now lowmass  United States
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Quote:
Originally Posted by atoluma View Post
Dave i'm very suprised about your distortion claim. I found the opposite and Troels too:

WITH BACK cup

Click the image to open in full size.

WITHOUT
Click the image to open in full size.


futhermore , remove the back cup lower the resonance frequency so I found it usufull to use this tweeter from 2khz. but maybe we don't talk about the same thing?
Question, how far is mic from the driver in these distortion measurments?
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Old 28th July 2017, 12:20 AM   #20
atoluma is offline atoluma  France
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ask Troels. I can't find mine but I had similar result.
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