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Diffusor dimensions for backwall of my new controlroom
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Topic: Diffusor dimensions for backwall of my new controlroom (Read 30243 times)
Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #15 on:
April 28, 2009, 02:52:42 pm »
I'm so sorry to hear...
Hope you get better asap!
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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franman
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #16 on:
May 04, 2009, 08:51:22 pm »
Jeez Constantin.. please get better quickly...
FM
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #17 on:
July 12, 2009, 04:23:06 pm »
Hi friends
I continued with my studiobuild and have some new pics of the progress.
After Thomas words of wisdom i worked on the backwall design of my future controlroom.
Here is a pic of the actual plan.
I also poured the concrete in the samll recording booth and will finisch it with selfleveling concrete next week.
I also build the first 2 doors for the studio. The are made at 3 sheets of MDF. 1st layer 19mm, 2nd layer 23, 3rd layer 10mm.
Door closing is given by a doorcloser and 5 magnets (each 6kg holding power).
Do you have a great tip for a good sealant (rubber) for the doors?
I´m very happy to be able to work without pain
cheers
Constantin
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Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #18 on:
July 13, 2009, 02:34:11 am »
Good to see your health is back!
What are you going to use as membrane?
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #19 on:
July 13, 2009, 06:25:36 am »
For the 2 boxes at the sides i will use 3mm HDF and for the box in the middle i will use a steel plate (1mm or 2mm) not shure until know.
The Steelplate will not resonate over an air cavity, it will be touching a dampening material like basotec.
The 2 Woodpannels will resonate over an airspring, but i will fill some fluffy isover in the box.
I try to tune the woodpannels to about 70hz, and the steelpannel to 45hz.
Good idea?, or waste of time?
cheers
Constantin
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Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #20 on:
July 13, 2009, 06:57:55 am »
Steel... Hmmm...
Maybe you want to use a product with a resilience more suited for the use.
Something with good density still. You should not have it as the first layer either.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #21 on:
July 13, 2009, 03:14:45 pm »
Quote:
Steel... Hmmm...
Maybe you want to use a product with a resilience more suited for the use.
Something with good density still. You should not have it as the first layer either.
It`s a well tested patent from Frauenhofer institute and called VPR (Verbundplattenresonator)
The trick is to use Basotec as the spring so steel is a perfect Membrane for this purpose.
The spring properties of Basotec are much different than air, so i`m not affraid of using this patent for my room.
And it won`t be the first layer, because my client Sofa is in front of the Resonator
( another big porous (ikea) absorber)
Have you ever heard about these VPR design?
i have good experience with it. no rattle, etc.
cheers
Constantin
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Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
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Reply #22 on:
July 13, 2009, 04:07:32 pm »
Yup, not the Frauenhofer thing, but dampened membranes, sure.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #23 on:
July 14, 2009, 02:23:21 pm »
here is the resonator i talk about:
http://www.ibp.fhg.de/akustik/ra/vpr/index_e.html
cheers
constantin
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tom eaton
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Re: Diffusor dimensions for backwall of my new controlroom
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Reply #24 on:
July 15, 2009, 11:00:41 pm »
My RPG Modex plate bass traps are steel.
http://www.rpginc.com/products/modexplate/index.htm
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Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #25 on:
July 16, 2009, 11:44:17 am »
tom eaton wrote on Wed, 15 July 2009 22:00
My RPG Modex plate bass traps are steel.
http://www.rpginc.com/products/modexplate/index.htm
And they're good.
My point is: in Constantin's case, I would not use steel. Unless he has ALL data to make sure it's the right thickness, right type (many to chose from) etc.
I generally don't use steel for membrane, but that's a personal choice. Steel works.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #26 on:
July 16, 2009, 12:44:02 pm »
Hi Thomas and thank`s for your advice
Quote:
I would not use steel. Unless he has ALL data to make sure it's the right thickness, right type (many to chose from) etc.
Isn`t it the mass and the springstiffness which is important for the resonantfreq? It`s quite easy to find out the mass of different steel`s.
Or do you talk about the rigity of the membrane as part of it`s amount of absorbtion?
i would be happy when you point out why you wouldn`t choose steel.
Is HDF a better choice?
i can use also MDF (i can get it for free.
I´m happy for all tips i can get from persons like you, since i trust in your advice.
cheers
Constantin
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #27 on:
July 16, 2009, 03:23:55 pm »
Update:
The Fan`s for the ventilation system arrived.
For the controlroom i have a EBM Papst W2G130-AA33
[url]
http://docs-europe.electrocomponents.com/webdocs/00e6/090076 6b800e6c45.pdf
[(url] which gives about 350m
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Thomas Jouanjean
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #28 on:
July 17, 2009, 02:58:03 am »
Constantin wrote on Thu, 16 July 2009 11:44
Isn`t it the mass and the springstiffness which is important for the resonant freq? It`s quite easy to find out the mass of different steel`s.
Or do you talk about the rigity of the membrane as part of it`s amount of absorbtion?
They are all important
About steel, they can be very different. They can have the same mass but completely different behaviours. For ex High-strength steel will be very very stiff, and yet have the same mass as a rather elastic type of steel. And so on. So mass/thickness while being a good indicator, is indeed not sufficient...
(Yes, my wife works for the steel industry, no foolin' around with those things at home
)
Constantin wrote on Thu, 16 July 2009 11:44
i would be happy when you point out why you wouldn`t choose steel.
I would use a system using air as a spring, with a material with high resilience but still a "hard" material. For ex some thermosplastics (PMMA) are great for that purpose.
If I told you more I'd have to kill you
But again, steel as you describe it WILL WORK. Just pointing out a few other options out there, which may be more suitable.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
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Constantin
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Re: Diffusor dimensions for backwall of my new controlroom
«
Reply #29 on:
July 17, 2009, 06:01:55 am »
Quote:
If I told you more I'd have to kill you
One day you must do it in reality
I ask to much !
Thanks for the Tip with the PMMA, i will have a look at these material.
What do you think about the ventilation dimensions? My research told me, that i`m in a safe area, but the examples/guidlines (DIN EN 13779) i found are based on living rooms and restaurants.
cheers
Constantin
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Diffusor dimensions for backwall of my new controlroom