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Author Topic: Diffusor dimensions for backwall of my new controlroom  (Read 27456 times)

Offline franman

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #45 on: April 01, 2010, 11:27:40 pm »
Mika,

Welcome back.. I bet your floor reflection is gone with all that 'desk' in place now... is it not??

of course.. there's always the new set of shorter reflections off the desk, right....


FM
Francis Manzella - President, FM Design Ltd.
                 - Managing Director, Griffin Audio
fmdesign.com
griffinaudiousa.com


Offline Thomas Jouanjean

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #46 on: April 02, 2010, 12:52:16 pm »
franman wrote on Thu, 01 April 2010 22:27

of course.. there's always the new set of shorter reflections off the desk, right....


"Didn't we talk about not using a Boss Flanger on the guitars?"  Very Happy

Keep the good work Mika! Soon there!
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
http://www.facebook.com/pages/Northward-Acoustics/1062876633 71

Pro Audio Partners:
ATC Loudspeakers
FOCAL Professional Speakers

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #47 on: April 04, 2010, 09:18:08 am »
Yes Fran.
The dip is gone.
i moved the istening position a bit to the back, turned the speaker, so now the woffer is up and the tweeter down, what gives me better conditions in case of desk refections. And the tweeter is now more at ear higth. The acoustic center of the speaker is now exactly at earhight.

I still have some problems with modal ringing under 200hz down to subbass.
I added 6x Helmholtzresos (10dm

Offline franman

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #48 on: April 06, 2010, 10:09:39 pm »
We always use lots of internal damping in Helmholtz resonators... The Q is too sharp without this. I don't think you can have too many of this type of trap. They should not re-introduce any tone into the room. They should only smooth low frequency decay (ringing) and bring the perceived bass out into the room. You are operating in the upper range of where I would typically use this type of trap but it's ok... Membrane traps are fine as well, but you need a significant amount of surface area to get enough sabines into the room IMO..
Francis Manzella - President, FM Design Ltd.
                 - Managing Director, Griffin Audio
fmdesign.com
griffinaudiousa.com


Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #49 on: April 08, 2010, 03:26:26 pm »
Thanks for this info Fran.
Yes i think i will bring in some more Helmholtz Absorbers.
When i want to calculate the sabines for a helmholtz absorber, is this just the port Area of the resonator what matters? Or resonatorport plus mouthcorection?

Is it more efficent to have many small resonators, or some bigger ones.
i think more smaller ones, because the port area is bigger.



I am still struggeling with the 100hz celling to floor mode.
i think i have to angel my cloud and ad a rigid back!?
But i will wait until my subwoofer arrives. i hope that the woffer fills this dip a little.

I will keep you updated
great forum Smile
cheers
Mika

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #50 on: April 10, 2010, 03:37:17 pm »
Hey freinds  Smile
some pics from todays work on the backwall of the CR.
Sorry for the bad cellphone pics  Rolling Eyes

http://img151.imageshack.us/img151/706/bild006h.jpg

http://img442.imageshack.us/img442/8996/bild007ot.jpg

http://img638.imageshack.us/img638/5078/bild008l.jpg


cheers
Mika

Offline Thomas Jouanjean

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #51 on: April 12, 2010, 10:18:12 am »
Well done  Smile
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
http://www.facebook.com/pages/Northward-Acoustics/1062876633 71

Pro Audio Partners:
ATC Loudspeakers
FOCAL Professional Speakers

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #52 on: April 12, 2010, 02:18:40 pm »
Thank you Thomas  Smile

Can you say something to the idea to break up the cellig/floor mode with angel the cloud and add a rigid back?

The cloud is about 2m wide and 1,7m long 30cm thick, filled with 5kPa Isover TP1.
I could angel the cloud about 15

Offline Thomas Jouanjean

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #53 on: April 12, 2010, 03:29:33 pm »
The problems will be:

- Is there a sufficient area to play with
- Is there enough thickness / density in your 'rigid back' and what's the realtive distance to the real ceiling
- Is it the right treatment
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
http://www.facebook.com/pages/Northward-Acoustics/1062876633 71

Pro Audio Partners:
ATC Loudspeakers
FOCAL Professional Speakers

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #54 on: April 12, 2010, 03:49:39 pm »
The cloud is about 2m X 1,7m but shaped.
I have some leftover 10mm MDF which i could place at the back of the cloud.
The distance now is about 30cm top of cloud to cellig (no angel)
when i angel the cloud the frontside could come down to 50cm distance between rigid back and celling.
the null is around 105hz

useful plan , or waste of time?

cheers
mika

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #55 on: April 15, 2010, 12:18:57 pm »
Yeahhhhhh  Very Happy
Subwoofer and EQ arrived today.
A Yamaha SW 10
So i placed the sub very rough, and played with some EQ to reduce some peaks caused by flushmounting the speakers.

New Freqeuncy plot looks realy good to me.
There is 1/24 smoothing,so this is the truth  Razz

http://img248.imageshack.us/img248/3234/mitsub.jpg


What do you think?
continue to optimize, or accept it like it is?

cheers
Mika Smile

Offline Thomas Jouanjean

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #56 on: April 16, 2010, 06:29:37 am »
Looks really good indeed.

Much  better than a lot of bigger studios out there!

Good job!  Smile
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
http://www.facebook.com/pages/Northward-Acoustics/1062876633 71

Pro Audio Partners:
ATC Loudspeakers
FOCAL Professional Speakers

Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #57 on: April 16, 2010, 10:21:40 am »
Quote:

Looks really good indeed.


Smile Thank you


Quote:

Much better than a lot of bigger studios out there!


Realy?  Shocked  
I never visit a "real" Studio.
It would be intressting to do this one time to hear another place, than my builded places.

What about your Project in D

Offline franman

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #58 on: April 17, 2010, 05:08:33 pm »
Mika,

That looks slammin indeed!! How does it sound?? Depending on the speakers, the HF rolloff is a subjective thing based on taste, but the midrange and LF are better than many if not most that I measure....

FM
Francis Manzella - President, FM Design Ltd.
                 - Managing Director, Griffin Audio
fmdesign.com
griffinaudiousa.com


Offline Constantin

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Re: Diffusor dimensions for backwall of my new controlroom
« Reply #59 on: April 18, 2010, 06:16:56 am »
Hey Fran
Thanks for your comment.
I would be intrested of a meassurement of a professional build room about 25m