My latest mid tops - nexus-acoustics - Violence
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Category: General
Forum Name: Show Off Your Sound System
Forum Description: Show of your gear. Post pictures of your Sound System here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=83848
Printed Date: 27 March 2026 at 4:06am
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Topic: My latest mid tops - nexus-acoustics - Violence
Posted By: Mircea Bartic
Subject: My latest mid tops - nexus-acoustics - Violence
Date Posted: 05 December 2013 at 10:54pm
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I just wanted to show you my latest creation. It's a 3 way mid top with horn loaded mid and high sections. They are loaded with: 1x15" woofer - P-audio P150-2226 - 1000W 1x10" mid - P-audio P10-100MB - 300W 1x1.5" Driver - P-audio BM-D740II - 100W The mid + high section's sensitivity is 106 dB/1W @ 1 m The Low section's sensitivity is 99dB/1W The speaker is biamplified with the woofer on 1+, 1- and the mid+hi on 2+, 2- I am using a passive crossover between mid and driver. The crossover points are 250 and 2500Hz  i will post more pics from the construction process tomorow ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Replies:
Posted By: AJordan
Date Posted: 05 December 2013 at 11:21pm
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Verryyyy Nice!!!!!!!!!!!!!!!! |
Posted By: TENSiON
Date Posted: 05 December 2013 at 11:26pm
Your own midflare or did uncle Wong help there a bit?  Long time since I saw such combo with a reflex bottom end.. Looks great and I bet it also sound at least as good  Good job. |
Posted By: Mircea Bartic
Date Posted: 05 December 2013 at 11:33pm
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The fiberglass horn and phaseplug are made here in Romania. I'm not really a friend of mister Wong :) ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: SamV
Date Posted: 05 December 2013 at 11:50pm
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Looks tidy but I would've recessed the whole lot so the forma could cover the full front. |
Posted By: discosucks
Date Posted: 06 December 2013 at 1:05am
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^^ i wouldn't it looks mean How come you didn't horn load the 15 too? seems to be a popular design .
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Posted By: SamV
Date Posted: 06 December 2013 at 5:15am
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Isn't the HF the wrong way around? |
Posted By: all bass
Date Posted: 06 December 2013 at 5:43am
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Looks sharp Mircea. Did you rotate the HF horn to give it a tighter dispersion for horizontal arraying? ------------- https://www.instagram.com/my_modular_journey/ |
Posted By: Mircea Bartic
Date Posted: 06 December 2013 at 7:30am
I wanted to make it look more agressive.
the ideea was to have a mid top that can be used also without subs for smaller events and not need a forklift to move. Horn loading the LF would have reduced the extension and made the box a lot bigger.
No, the horn is mounted the correct way (it's a PH64 - 60x40degree dispersion) We had a discussion with the design department at P-audio a few years ago about the correct mounting of these horns. Turns out that this is how they're supposed to be mounted for the corect dispersion.
see above ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
SamV wrote:Posted By: Lee83
Date Posted: 06 December 2013 at 9:14am
| Very tidy indeed I like it, agree with Sam the horn flare *looks* the wrong way round! |
Posted By: VentureSound
Date Posted: 06 December 2013 at 10:33am
I think the HF is the wrong way wrong! I have some EV cabs with very similar horns and yours are 90 degrees rotated compared to mine. My cabs are 60 H x 40 V dispersion. |
Posted By: ArthurG
Date Posted: 06 December 2013 at 11:17am
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Mircea, this model looks nice , I like it  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 !
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Posted By: Mircea Bartic
Date Posted: 06 December 2013 at 12:46pm
Thank you, Arthur 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  ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: andycw
Date Posted: 06 December 2013 at 12:58pm
If you need me to run some 'tests' send a couple my way  ------------- No Bass No Fun |
Posted By: cravings
Date 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. |
Posted By: KidCreole
Date Posted: 06 December 2013 at 1:22pm
hundreds per month |
Posted By: Mircea Bartic
Date Posted: 06 December 2013 at 1:26pm
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. ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: cravings
Date Posted: 06 December 2013 at 1:37pm
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looking again the pic is back the other way on their data sheet ( http://www.paudiothailand.com/showproduct.cfm?id=491" rel="nofollow - 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. |
Posted By: ArthurG
Date Posted: 06 December 2013 at 2:27pm
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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 What's the size & weight of this cabinet ?
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
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Posted By: KidCreole
Date Posted: 06 December 2013 at 2:48pm
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Start a fresh one then |
Posted By: cravings
Date 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! |
Posted By: VentureSound
Date Posted: 06 December 2013 at 5:08pm
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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" rel="nofollow - 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. |
Posted By: Mircea Bartic
Date Posted: 06 December 2013 at 5:54pm
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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" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: Mircea Bartic
Date 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 http://www.facebook.com/nexus.acoustics.research" rel="nofollow - https://www.facebook.com/nexus.acoustics.research ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: AJordan
Date Posted: 10 December 2013 at 7:49pm
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Oooh quick! Take em down before SMP sees em! That flange on the mid looks a bit wonky! I love em by the way! |
Posted By: Andy Kos
Date Posted: 10 December 2013 at 9:30pm
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Nice job. ------------- just a guy with a warehouse and a few speakers... www.bluearan.co.uk |
Posted By: Nikkolas
Date Posted: 10 December 2013 at 10:05pm
| Great job! I like the fact that it looks mean and not hiding everything behind some foam. Why did you make them passive and not self powered? |
Posted By: SMP
Date Posted: 10 December 2013 at 10:09pm
Too late!!! very "nice" I just love the way people credit them with accolades without hearing them but they look nice even though I ALSO HAVE MY DOUBTS ON THE DISPERSION!!! looks 40 x 60+ from here polar plots??? on axis is so uninformative as to real world behaviour |
Posted By: odc04r
Date Posted: 11 December 2013 at 7:35am
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I remember a discussion a long time ago with some links to papers regarding Rog and Void high frequency horn flare which ended up on PSW. The papers were regarding dispersion and the conclusion was that the first 1/3 of a flare is the most significant with regards to controlling dispersion. So if this is the case then looking at that horn you could see how it is mounted correctly for dispersion whilst presumably the rapid expansion at the end of the vertical flare provides a better impedance match to free air. It was a long time ago, I have probably got a few details wrong! |
Posted By: Heathrow_B_line
Date Posted: 11 December 2013 at 2:10pm
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why is the access panel not flush with the back? ------------- Produce a killer sound. Take no prisoners. |
Posted By: bitSmasher
Date Posted: 11 December 2013 at 9:14pm
| Would p.audio have pattern flip in mind with that horn's orientation? |