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Multi-Way Conventional loudspeakers with crossovers

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Old 20th February 2015, 03:04 PM   #471
Juhazi is offline Juhazi  Finland
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AINO gradient Neo83
Click the image to open in full size. Click the image to open in full size.

I have now new birch plywood baffles for BG Neo8 and Neo3 drivers. The tweeter is paced horizontally, because it measures better that way. The baffles were CNC'd by Kuviopuu and coated with transparent Osmo wood wax. I hope that this MkIII version will serve me for along time! I will buy extra Neos for spare parts because it looks like they will be out of production now.

Drivers
BG Neo3PDR dipole highpass LR4 3500Hz acoustic
BG Neo8PDR dipole highpass LR4 600Hz lowpass LR4 3500Hz
Beyma MW12Nd dipole highpass LR2 160Hz lowpass LR4 600Hz
SEAS L26ROY sealed Lowpass LR2 160Hz

Body
Sealed box 30 liter, MDF slices stacked, automotive paint
Pole and baffle solid birch/plywood, Osmo wood wax

Height 120cm (4') Weight 42kg (92lb)

Minidsp 4x10Hd (analog input from AV-receivers's pre-out, AV works as input selector)
Amplifiers B&O ICEpower ASX125 and 50 modules
Frequency range 15-16000Hz, room eq possible with dsp

Some measurements and pictures!
Attached Images
File Type: jpg ainogneo83 v2a LR 500ms 16 rta-vert.jpg (237.8 KB, 1943 views)
File Type: png ainogneoc v2 0-90¤ 90-180¤-tile.png (623.5 KB, 2394 views)
File Type: png ainogneoc v2 spl phase gd csd disto-tile.png (842.7 KB, 1812 views)
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Last edited by Juhazi; 20th February 2015 at 03:15 PM.
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Old 10th March 2015, 08:47 AM   #472
Juhazi is offline Juhazi  Finland
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Still some more bass and upper mid/low treble tuning... After a week's listening this sound still very good. Hancock's River CD is spinning with great pleasure now!
Click the image to open in full size.
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Old 10th March 2015, 08:57 AM   #473
lolo is offline lolo  France
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Hello!

Nice effort, but why not second or even first order crossover between the neos? How loud do you you listen? You probably noticed that SL himself ditched the LR4 in the midrange.

The directivity is great, but the step response does not look good..

Last edited by lolo; 10th March 2015 at 09:00 AM.
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Old 10th March 2015, 10:12 AM   #474
Juhazi is offline Juhazi  Finland
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I have an optional configuration with LR2 all the way.

It measures almost the same but looses far off-axis and backwards. The cone resonance of Beyma is at 16/1800Hz, this is the worst single measured problem. It can be eq'd and it must be done with LR2. Overall distortion is also significantly worse in range of 200-2000Hz at loud volumes. I have posted measurements earlier, perhaps a year ago.

When listening the sound is more diffuse, too much tizzle in low treble here in my rather highly reverberant room.
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Old 10th March 2015, 02:56 PM   #475
zmyrna is offline zmyrna  United Kingdom
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Hi,
I am always interested in your work because I have very similar set of drivers in my hand and like OB designs.

First a comment on aesthetics:
Because naked drivers look very industrial, I would have gone for an all metal free hanging type frame for the part that is above the subwoofer.

Second:
I have been thinking of using the Neo8s on its own to cover the frequencies >1000Hz (no add on tweeter).
The main problem with that is the vertical dispersion of Neo8s. But reticulated foam wedges might solve that problem as in Raal 140-15D
www.audioexcite.com Blog Archive RAAL 140-15D Ribbon Tweeter Measurements!
You have excellent measurement facilities; would you be game to try the foam trick on Neo8s?
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Old 10th March 2015, 03:01 PM   #476
zmyrna is offline zmyrna  United Kingdom
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BTW, I did try Neo8s as a tweeter with some wool felt applied in up-down position
(neo pdr use felt in left-right position)
and it sounded very good to my ear (better than neo3 actually)
no measurements though
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Old 10th March 2015, 04:05 PM   #477
Juhazi is offline Juhazi  Finland
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I have not tested Neo8PDR for off-axis vertically (on long dimension) with recorded data. I don't think foam wedges would do much benefit.

I will soon get a sparepart Neo8PDR, then I can run some tests. Changing the Fountek NeoCD3.5 to BG Neo3 resulted in much wider vertical dispersion an heavier backside radiation. These gave a really good and natural increment to upper treble in the room.

After these experiences I believe in wide dispersion treble! Narrow disp. is not as good even if one sits in the spot, because decay is too fast compared to other frequencies!

Regarding frame construction esthetics and functionality, perhaps things could be better in either or both... But I am stuck with Finnish birch plywood!
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Old 27th April 2015, 07:09 PM   #478
Juhazi is offline Juhazi  Finland
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I am getting ready to attend to the Finnish DIY-event held in Hyvinkää 23rd May. On a rainy Sunday I fixed a new 18-page presentation, available as pdf from me. PM me to ask for it!
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File Type: jpg ainog83 prujukansi.jpg (69.3 KB, 340 views)
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Last edited by Juhazi; 27th April 2015 at 07:11 PM.
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Old 16th May 2015, 07:02 AM   #479
Juhazi is offline Juhazi  Finland
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I just purchased a NHT Power2 amplifier, second hand. 2x500W of ICEpower D-class!

After the diy-event May 23rd I will rearrange the amplification - Power2 to drive lower mids, 125ASXs in BTLmode (250W) to drive bass units. 50ASX seems sufficient to drive the rather sensitive BG Neo units.
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Old 16th May 2015, 08:46 PM   #480
ScottG is offline ScottG  United States
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Quote:
Originally Posted by Juhazi View Post
After these experiences I believe in wide dispersion treble! Narrow disp. is not as good even if one sits in the spot..



-and the oddity is that most designs (diy and commercial) seem to be on a "course" headed in the opposite direction. Often proclaiming some objective virtue with respect to minimizing room reflections.

Note the "depth" add-on to the Sonus Faber Aida (scroll down to the bottom and left):

http://www.absolutesounds.com/pdf/ma...ophile0712.pdf

and heard here:

https://www.youtube.com/watch?v=elAPzY-ZhXE
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