BG Neo 8 PDR vertical dispersion... is this a solution ? - diyAudio
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Old 11th February 2014, 11:26 PM   #1
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Default BG Neo 8 PDR vertical dispersion... is this a solution ?

Hello everybody. I've read that the BG Neo 8PDR has very good horizontal dispersion but lacks in vertical dispersion. That is, a person sitting may hear something different from a person standing in front of the same speaker. (I read this somewhere, I'm not making this up...)
I've managed to build 2 small enclosures that will place 2 BG Neo8 in each main cabinet, one aimed slightly upward, the other slightly downward in relation to each other. Maybe 170-175 *. (think of a > with the sides nearly horizontal to the front baffle). The front baffle could also be slightly tilted as needed to help dispersion.
While we're at this, if I use 2 Neo8 PDR drivers, how would you recommend I wire them to stay in phase?
Kindly remember this is a simple question from a begginner, good advice is welcome, the others will have pins stuck onto the ears of my voodoo doll.
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Old 12th February 2014, 06:29 AM   #2
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I use amt´s DIY with 170*
I am very satisfied with the dispertion now.
[IMG]Click the image to open in full size.[/IMG]

Bernt
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Old 12th February 2014, 01:04 PM   #3
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Thanks for your prompt reply.
Can you please provide me with the wiring diagram you're using? I'm still in doubt on how to wire them to maintain them in phase... or should I purposefully wire them out of phase?
Do you use a notch fliter? I know the BG Neo8 PDR should use a notch filter for a 10,000 Hz horrific spike, maybe this does not apply to your drivers.
And lastly, could you PLEASE post a picture of your speakers ?
QUITE IMPRESSIVE !!
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Old 12th February 2014, 01:50 PM   #4
Eldam is online now Eldam  France
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Location: At home, sweet sound home...
hi

What is the reason please of the 90° titled mid-bass? Narrower directivity ? Less power or side walls reflexions ?

each AMT has the same frequency range ?

regards
Eldam
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Old 13th February 2014, 11:46 AM   #5
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I am not using notch filter for the Amt´s.
Wiring: + O - +O - to keep them in fase.
Here a tread about my Pluto clones incl. sub:Pluto clone incl. sub
I did´t use 2 amts at first models.
The bas/mid is tilted to get omnidirektional dispertion.
Each Amt covers the same frequency range:from 1200hz .

Bernt
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Old 15th February 2014, 08:47 PM   #6
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I realize the tread specifies top/bottom alignment on the BG Neo 8's.
I've seen several speakers that have them side by side.
As I understand, they have very good lateral dispersion, so to me side by side may not be the most practical.
Is there a "better way" that's been tested ?
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Old 16th February 2014, 01:06 AM   #7
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Also dear friend bandsei, I can deduct that you wire your amt in parallel, + to +,
neg to neg. Is this correct ?
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Old 16th February 2014, 06:50 AM   #8
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No ,it is in serie + speaker - +speaker -

Bernt
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Old 16th February 2014, 09:17 AM   #9
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by Jvsantosmd View Post
BG Neo 8PDR has very good horizontal dispersion but lacks in vertical dispersion.
I've managed to build 2 small enclosures that will place 2 BG Neo8 in each main cabinet, one aimed slightly upward, the other slightly downward in relation to each other.
if I use 2 Neo8 PDR drivers, how would you recommend I wire them to stay in phase?
Narrow vertical dispersion can be an advantage...
Otherwise, your solution is good, but bottom Neo should be almost vertically oriented and aiming at head level while sitting (nobody listens laying on the floor) and top Neo slightly upward.
You must connect serially two Neos and in phase, + from amp/crossover to the first Neo's +, than it's - to + from the second Neo. Neo 8 PDR impedance is about 5.2 ohm, so parallel connection will be unacceptably low at 2.6 ohm.
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Old 20th February 2014, 11:23 PM   #10
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I have since decided to place them both flat against the front baffle.
The front baffle is going to be 7 inches wide with both sides cut at 45* corners.
Still crunching numbers as to the best crossover frequency for a series type wiring.
Any help here is appreciated.
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