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BG NEO 3 FR optimization
BG NEO 3 FR optimization
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Old 17th January 2018, 12:40 PM   #51
pixelpusher is offline pixelpusher  United States
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It is smoothed 1/12 octave, gated 5ms, at 1 meter, dipole (no back cup), on a flat 4 foot square testing baffle. No crossover involved. I took impulse response measurements at 0,15.30,45 and 60 degrees. I can post those later today.
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Old 17th January 2018, 06:29 PM   #52
Juhazi is online now Juhazi  Finland
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Ok here are my measurements of it at 1m in a narrow dipole frame, 5ms no smoothing and with 1/12 smoothing. Horizontal angles 0, 30 and 60¤

Obviously the minimal frame around the driver is making most of ripples, general shape is more standard. I have not measured it at all in a baffle!

In my AINOgradients the Neo3 is sideways, then horizontal directivity matches the general dipole pattern better. Notice the directivity is constant below3,5kHz which means true dipoel pattern. I cross it with Neo8 around 4kHz
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File Type: jpg neo3pdr 0 30 60 hor noeq 5ms 112.jpg (141.3 KB, 291 views)
File Type: jpg neo3pdr 0 30 60 hor noeq 5ms nosmo.jpg (165.5 KB, 288 views)
File Type: jpg neo3pdr 0 30 60 vert noeq 5ms 112.jpg (137.7 KB, 284 views)
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Last edited by Juhazi; 17th January 2018 at 06:37 PM.
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Old 17th January 2018, 10:09 PM   #53
pixelpusher is offline pixelpusher  United States
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Quite a notch at 7K! Is that due to the narrow baffle?
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Old 17th January 2018, 10:28 PM   #54
pixelpusher is offline pixelpusher  United States
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Here is a comparison of the BG3_PDR with and without the putty phase plugs. Green curve is with the treatment. I don't see this as an improvement. Perhaps a 3D printed version would improve things but I wouldn't get my hopes up. I wish the OP would comment. His measurement seems too good to be true.

Measured at 1 meter, on axis on a 4 foot square flat baffle, open back with the treatment on the back as well. Measurement is gated 5ms with no smoothing.
Second image is with treatment off axis 0,15,30,45, and 60 degrees.
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File Type: png putty_no_putty.PNG (44.6 KB, 276 views)
File Type: png off_axis.PNG (53.9 KB, 276 views)
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Old 17th January 2018, 11:30 PM   #55
aczern is offline aczern
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Maybe the reason is something else Loudspeaker Measurements
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Old 17th January 2018, 11:39 PM   #56
bolserst is offline bolserst  United States
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Quote:
Originally Posted by pixelpusher View Post
... I don't see this as an improvement....Measured at 1 meter
You might try near field measurement with mic placed ~1cm from the front plate.
I'm pretty sure the OP measurements were near field(dipole with no baffle) and it is possible the improvement shown had more to do with mic placement than the modification. The disappearance of the large notch at 3kHz seems unlikely to have come from the modification considering the dimensions involved.

Looking at Figure 8 in the patent mentioned in Post#22 it only really shows changes >7kHz...much like you.
Then again, the patent was intended for use in headphone drivers, so maybe larger differences are seen/heard near field.

Last edited by bolserst; 17th January 2018 at 11:42 PM.
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Old 18th January 2018, 07:00 PM   #57
Juhazi is online now Juhazi  Finland
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Quote:
Originally Posted by pixelpusher View Post
Quite a notch at 7K! Is that due to the narrow baffle?
Sorry but I don't remember exactly in what kind of frame the driver was mounted, or was is free. That looks similar to AINOgradient which has 8mm thick plywood baffle, driver mounted on the backside. The frontside opening has chamfered edges but it makes some interferences. It is propably the dipole null, but with frame thickness adding some interferences.

This is almost two meters distance, in AINO baffle outdoors, 5ms 1/24 smoothing on-axis. Neo3PDR sideways in the frame. It can be seen in some of my other measurements in the baffle and I use some eq because it affects room response (long gating) too!

It always takes some time and several different measurements to find out what is causing the deviations that we see! The lower the frequency, the more difficult it is to measure! And with high frequency, very small changes can make a difference!
Attached Images
File Type: jpg ainogneo83 vx out T 0 30 60 5ms 124.jpg (145.3 KB, 62 views)
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Last edited by Juhazi; 18th January 2018 at 07:08 PM.
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Old 25th January 2018, 02:47 AM   #58
dheming is offline dheming  United States
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Originally Posted by Fjendbo View Post
You can post some screen dumps

But I'll wait on this new version then, thanks!
So it turns out that flat bed scanners have a tendency to distort/stretch things horizontally and/or vertically by some amount. That puts a damper on using the scanned images to directly model from. So this approach seems like a dead end.
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Old 1st February 2018, 09:33 AM   #59
Fjendbo is offline Fjendbo  Denmark
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Originally Posted by dheming View Post
So it turns out that flat bed scanners have a tendency to distort/stretch things horizontally and/or vertically by some amount. That puts a damper on using the scanned images to directly model from. So this approach seems like a dead end.
Okay. I can easily accept the version already been made.

Also, it appears according to some of the measurements in this thread, that the effect is most pronounced for headphone use. So there might not be much to gain after all.

Nonetheless, I have to try it out when I get the chance.
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Old 2nd February 2018, 05:41 PM   #60
OscarS is offline OscarS  United States
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Excellent thread. AMT's also have bars that run horizontally right in front of the radiating element. I think I shall try a similar modification to see if there is also benefit there.
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