12" BPH design. |
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LeruSound
Registered User Joined: 27 August 2015 Status: Offline Points: 171 |
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Posted: 06 March 2018 at 9:27pm |
I'm gonna post here some HR pics of Response of this 12" BPH i'm modeling. I have some questions OFC as this is my first BPH
This is response with 18Sound 12ND730 This is response of B&C 12NDL76 First, tuning of band pass resonating part is quite high, around 150 Hz. That i don't know if worth.
The woofer is ment to go up to 300-350 Hz, being a part of 3-way midtop system. I'm trying to model the horn that is more towars horn and less resonating, so i get a tighter sound, less springness & good eff. Getting a look to common BPH like ES18 and HD15 i noticed the very non linar response, that highlines the gap between the horn radiating and the resonating band. Otherwise l this non-linearity shown by HR response i never ever experienced in BPH like ES18 and USB, which i measured several time and i listen more than often. So What to do? Is it still good? Is the HR power response reliable? Should i lower tuning? Is NDL more suitable than ND730 in this case? Hother ways to design & model BPH if not HR? |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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I hope you realize that 12ND730 is discontinued.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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LeruSound
Registered User Joined: 27 August 2015 Status: Offline Points: 171 |
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No i didn't relized yet. I stopped buying from 18Sound last years cuz prices just have skyrocketed in 2017. ND730 doesn't appear in my 2017 pricelist, and i'm still waiting for the 2018 one, but i don't se any label saying its discontinued, pretty sad as was the one performed better.
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Prices have not changed much in the last 5-6 years. Must be your dealer doing that. Try 12ND930
Edited by MarjanM - 06 March 2018 at 10:59pm |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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LeruSound
Registered User Joined: 27 August 2015 Status: Offline Points: 171 |
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I'll try, any other advice or helpfull opinions?
About 18Sound, in my experience all prices have rised up a lot. There were more than one reseller here in Italy.. I had chance to get one 9601 for less than 400 €, get a look now.. Could be i am all wrong but i've been buying from different sources, and all are now more expensive. On the other hand B&C just keeps staying with same prices to me, lower than 18Sound.
EDIT: ND930 pretty much the same as NDL76 as i expected. The point of my questions is about BPHs, and how far is the simulation from reality, if anyone of you have any guidline in designing that, according to the consideration i wrote and the already modeled one i posted. Edited by LeruSound - 06 March 2018 at 11:44pm |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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We use the 9601 since it was introduced. Actually we used 9600 and asked for some customization that later actually became 9601.
So since 2010 the price have been increased exactly 5 euros.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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LeruSound
Registered User Joined: 27 August 2015 Status: Offline Points: 171 |
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Nice for you man! Ill get a look around. No have direct contacts with 18Sound, so fi sure there some shit happening in between. Now i would really appreciate if we can skip this and focus on the topic subject
Edited by LeruSound - 06 March 2018 at 11:53pm |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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If you manage to precisely convert the HR data in to a cabinet, it is pretty much spot on.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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LeruSound
Registered User Joined: 27 August 2015 Status: Offline Points: 171 |
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Yep, i already designed the box, and liters in hornresp have already been adjusted to what i've been able to build on 3d model. Just the mismatches i had measuring vs simulating (other BPHs) are stopping me from set design and start the building. Even i dont get the point to choose one NDL76 rather than MB650 if simulation is not close to reality due to BPH hybrids behaviors. Edited by LeruSound - 07 March 2018 at 12:00am |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 563 |
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One thing HR cannot tell you is when the response of a BPH goes from useable to honky-mess, largely since that is due to the layout of the cabinet whilst HR only simulates things as a straight, cylindrical design
From my experiences of dabbling with BPHs, you will struggle to get it non-honky above 200Hz |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Yeah well, software predictions can only do so much. It is not called R&D for nothing.
You build a box, measure, tweak/build another one, or seven, until you do it right. If it was that easy everyone would be building boxes.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 563 |
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and how! If it was easy then nobody would be paying £££££ for Fk1 BPHs |
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