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My latest mid tops - nexus-acoustics - Violence
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Mircea Bartic View Drop Down
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Joined: 18 February 2005
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Points: 2589 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 12:46pm
Thank you, ArthurEmbarrassed

The speaker needs the following presets to obtain the final response.

Low (pin 1+, 1-)
 
High-pass 50Hz cu 24 dB/ oct Butterworth
Low-pass 250Hz cu 24 dB/ oct Butterworth
 
Parametric EQ
140Hz, -4dB, Q=3
 
Low Shelf 12db/oct , 90Hz, +8 dB Gain
 
 
Mid+ high (pin 2+, 2-)
 
High-pass 250Hz cu 24 dB/ oct Butterworth
Low-pass 20000Hz cu 24 dB/ oct Buterworth
 
Parametric EQ
220 Hz, +3dB, Q=4
400 Hz, -2dB, Q=3
12 dB/ oct High Shelf 12500Hz, Gain +6dB,

PLOTS:

Overall response with DSP


Mid+ High response,NO DSP with Passive crossover


Mid + High response, NO DSP, no Passive crossover, separate graphs





Edited by Mircea Bartic - 06 December 2013 at 12:57pm
general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research

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andycw View Drop Down
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Points: 994 		Post Options Post Options   Thanks (0) Thanks(0)   Quote andycw Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 12:58pm
If you need me to run some 'tests' send a couple my way LOL
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cravings View Drop Down
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Points: 7507 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 1:21pm
have you measured the high horns off axis to check the dispersion? i had noticed them pictured that way round on the p-audio site but was never sure which way round they should actually go.
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KidCreole View Drop Down
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Joined: 06 November 2013
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Points: 3580 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KidCreole Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 1:22pm
Originally posted by ArthurG ArthurG wrote:

Mircea, 

this model looks nice , I like it Clap
Do you have some frequency plots ? 
it reminds me one of my last design. It's a very very successful box. I'm selling hundreds per month.
Wish you the same success !
Show us yours

hundreds per monthEmbarrassed
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Mircea Bartic View Drop Down
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Joined: 18 February 2005
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Points: 2589 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 1:26pm
Originally posted by cravings cravings wrote:

have you measured the high horns off axis to check the dispersion? i had noticed them pictured that way round on the p-audio site but was never sure which way round they should actually go.

We did off axis plots for testing but didn't save them

the 60x40 degree dispersion can be matched by the mid horn.

Yes , we saw that too, so we asked P-audio directly and they confirmed us that that is the corect placement.

It goes against everything I know about horn design but they are right.


Edited by Mircea Bartic - 06 December 2013 at 1:28pm
general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research

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cravings View Drop Down
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Joined: 30 January 2007
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Points: 7507 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 1:37pm
looking again the pic is back the other way on their data sheet (link), but they show a box on their front page with this horn as you have it.

very confusing.

i agree it looks totally wrong.. i make no claim to understand horn design but comparing it visually to many other horns of known dispersion it seems backwards.
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ArthurG View Drop Down
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Points: 988 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ArthurG Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 2:27pm
Great Job Mircea !

I see that you apply a big EQ on the 2 extremities of the spectrum, but seems logic when you look at your HF (deep) horn and the sensitivity of your MHF section. Otherwise, your EQs in the mid bands are very limited to get a flat response, meaning that your acoustical optimization is well done Clap
What's the size & weight of this cabinet ?

Originally posted by KidCreole KidCreole wrote:

[Show us yours

hundreds per monthEmbarrassed
Looking at my production plan, I exaggerated a bit, real number is close to hundred per month (average), spread over 3 customers, covering North America, Africa, Europe and Asia. 
However, I don't want to hijack Micea topic so I won't post a link here Embarrassed
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KidCreole View Drop Down
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Joined: 06 November 2013
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Points: 3580 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KidCreole Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 2:48pm
Start a fresh one then
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cravings View Drop Down
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Points: 7507 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 3:11pm
agree they look like great boxes, really useful. sorry for derailing the thread into a p-audio discussion!
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VentureSound View Drop Down
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Points: 949 		Post Options Post Options   Thanks (0) Thanks(0)   Quote VentureSound Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 5:08pm
Just another point about the dispersion thing... My EV CD horns are 60 x 40 and in the back of the horn there is a vertical slot. With the slot in that position (vertical) the horizontal is 60 degrees dispersion.

Have a look here...

http://www.electrovoice.com/product.php?id=32

In the third picture you can see the horn throat and its vertical slot. That is as they come from the factory and its 60H.
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Mircea Bartic View Drop Down
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Joined: 18 February 2005
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Points: 2589 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 06 December 2013 at 5:54pm
There's no use in discussing the position of the HF horn. P-audio R&D confirmed it was correctly rotated for the 60 degree horizontal dispersion as odd as it may look.
general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research

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Mircea Bartic View Drop Down
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Joined: 18 February 2005
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Points: 2589 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2013 at 7:28pm
I prepared some pictures for the final product.










You can see a lot of my earlier projects on my facebook page
https://www.facebook.com/nexus.acoustics.research
general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research

Ex Nexus_3
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