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Need help to tune my control room. (First Measures Included)
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Alejandro Varela
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8th December 2012
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Need help to tune my control room. (First Measures Included)

Hi m8s, after weeks of reading another posts from users I decided to start mine's one. I' m not very experiment with acoustic but I' m "pure ears"!!!
My Axial Control Room has this size: 2,39 m Height x 3,06 m Width x 3,15 m Length. I have 2 Bass Trap Corners besides Speakers.
My System consist of three pair of Speakers System.
1 - Dynaudio BM-15A with Dynaudio BM-14S Subwoofer
2 - Yamaha NS-10 M
3 - JBL Control SB Micro

Today I made my first measures with REW v5 and Behringer ECM8000 mic (in Mono) and I got this Responses:

With Dynaudios:
Need help to tune my control room. (First Measures Included)-waterfall.jpg Name: waterfall.jpg Views: 468 Size: 107.9 KB ID: 320436" style="margin: 2px" />

Need help to tune my control room. (First Measures Included)-all-spl.jpg Name: all spl.jpg Views: 333 Size: 96.7 KB ID: 320437" style="margin: 2px" />

I had made measurements with Yamaha's too, but I don't think it's very important, isn't it?

Please, let me know what you consider to make first...
I trust in forum's experts.
Regards
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8th December 2012
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Built in Slat design (Scattering/Diffusion) on all Bass Traps click here
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Alejandro Varela
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9th December 2012
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Quote:
Originally Posted by Jens Eklund View Post
Play one speaker at the time when taking measurements.

Again:
Before posting your measurement results
I'm Sorry. I will make again tomorrow.
Just 1 question...
Should I connect Sub-low with any speaker measure or I need to make a measurement of Sub individually ?
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Quote:
Originally Posted by Alejandro Varela View Post
I'm Sorry. I will make again tomorrow.
Just 1 question...
Should I connect Sub-low with any speaker measure or I need to make a measurement of Sub individually ?
I would measure:

L with sub
R with sub
L (no sub)
R (no sub)
Sub only

If you´re in a hurry; do the first two.

Also; use a longer sweeps, about 6 or 12 seconds (256 or 512k FFT) is good. Play the speakers as lout as you feel comfortable with (as loud as possible without noticeable distortion). If your recordings are still noisy, use multiple takes (4 or more) to further improve the S/R ratio. You seem to have some action around 20 Hz so set your start frequency to 10 Hz instead of 20 Hz in order to see the 20 Hz mode properly.
Alejandro Varela
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9th December 2012
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Quote:
Originally Posted by Jens Eklund View Post
I would measure:

L with sub
R with sub
L (no sub)
R (no sub)
Sub only

If you´re in a hurry; do the first two.

Also; use a longer sweeps, about 6 or 12 seconds (256 or 512k FFT) is good. Play the speakers as lout as you feel comfortable with (as loud as possible without noticeable distortion). If your recordings are still noisy, use multiple takes (4 or more) to further improve the S/R ratio. You seem to have some action around 20 Hz so set your start frequency to 10 Hz instead of 20 Hz in order to see the 20 Hz mode properly.
Thanx Jens. I'll make it tomorrow. Please be patient.
Regards!!!
Alejandro Varela
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OK, here are the news.
NW8-2.zip
I noticed a lot of tremor noises in my room.
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Quote:
Originally Posted by Alejandro Varela View Post
OK, here are the news.
Attachment 320464
I noticed a lot of tremor noises in my room.
That is Sympathetic Vibration. It can be annoying and lots of things in a studio can rattle at high volume, even small things.

What kind of acoustic treatment do you have in the room thus far?
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Quote:
Originally Posted by OpusOfTrolls View Post
That is Sympathetic Vibration. It can be annoying and lots of things in a studio can rattle at high volume, even small things.

What kind of acoustic treatment do you have in the room thus far?
I have drywall (15 cm from brick with fiberglass between them) with a very slim carpet sticked. At Left, I have Double glass window to look at recording Rooms. Right side, nothing. At front there's a permanent closed window with a heavy drop curtain. At rear three closet doors (that sure need treatment) and the Control entry door. Ceiling has floating fiberglass panels. The floor has floating wood and the whole room its in a a floating stand, made of wood and filled with sand. And as I told you after, two Bass traps (near 1 mt each one) at speaker' s corner.

Last edited by Alejandro Varela; 9th December 2012 at 05:37 PM.. Reason: Changed some worlds and add information
Alejandro Varela
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Quote:
Originally Posted by Alejandro Varela View Post
OK, here are the news.
Attachment 320464
I noticed a lot of tremor noises in my room.
I had moved the sub-woofer position to the speaker's line (before it was under desk) and everything sounds better, less noises!!!!

Maybe should I need to make new measurements?
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Quote:
Originally Posted by Alejandro Varela View Post
I have drywall (15 cm from brick with fiberglass between them) with a very slim carpet sticked. At Left, I have Double glass window to look at recording Rooms. Right side, nothing. At front there's a permanent closed window with a heavy drop curtain. At rear three closet doors (that sure need treatment) and the Control entry door. Ceiling has floating fiberglass panels. The floor has floating wood and the whole room its in a a floating stand, made of wood and filled with sand. And as I told you after, two Bass traps (near 1 mt each one) at speaker' s corner.
Is the room rectangular or other geometry?

There are some sharp edges at about 120hz and 370hz. To locate the source of these would be a good start.

Bass traps could be added at the closet areas to improve the decay time in the lower bands.
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Quote:
Originally Posted by OpusOfTrolls View Post
Is the room rectangular or other geometry?
Yep, My Axial Control Room has this size: 2,39 m Height x 3,06 m Width x 3,15 m Length
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Quote:
Originally Posted by OpusOfTrolls View Post

There are some sharp edges at about 120hz and 370hz. To locate the source of these would be a good start.

Bass traps could be added at the closet areas to improve the decay time in the lower bands.
And I wanna know "how to locate the source of these"!!!
Are you talking about first reflections?
Pleaz help me!

Reagards
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Play a sine tone that switches on and off periodically, tuned at the problem frequencies, and walk around the room, listen. IT's complicated to explain but you need to really really listen and find the resonant anomaly.
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Quote:
Originally Posted by OpusOfTrolls View Post
Play a sine tone that switches on and off periodically, tuned at the problem frequencies, and walk around the room, listen. IT's complicated to explain but you need to really really listen and find the resonant anomaly.
You said to generate a periodic sine wave between 120Hz and 370Hz and find what freq sound most? worst? Loud? Less?
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Could you post some picture and or a drawing of your room? The symmetry from where you sit forward needs to be the same and it seems like the left and right readings are not match up (they should be close).
The low end looks like you need more trapping. 2 really is just a small start for most rooms.
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Quote:
Originally Posted by Alejandro Varela View Post
OK, here are the news.
Attachment 320464

Good.


Need help to tune my control room. (First Measures Included)-l-sub-400ms-10-hz-20-khz.gifNeed help to tune my control room. (First Measures Included)-r-sub-400ms-10-hz-20-khz.gifNeed help to tune my control room. (First Measures Included)-l-sub-400ms-10-hz-400-hz.gif
The waterfall reviles modal decay at 19, 36, 46, 54, 64 and 114 Hz.


19 Hz is very long:
Need help to tune my control room. (First Measures Included)-l-sub-1500ms-10-hz-400-hz.gif


Identify areas related to each mode and treat with appropriate panels, effective in the frequency range of interest.



Need help to tune my control room. (First Measures Included)-etc-l-sub.gifNeed help to tune my control room. (First Measures Included)-etc-r-sub.gif
The ETC show early energy above -20 dB. Identify reflections arriving within 15-20 ms (relative to direct) and absorb or redirect this energy. What you decide to do with the energy arriving after about 15 ms or so, depends on the desired acoustic response.
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Quote:
Originally Posted by Jens Eklund View Post
Good.

The waterfall reviles modal decay at 19, 36, 46, 54, 64 and 114 Hz.
19 Hz is very long:
Identify areas related to each mode and treat with appropriate panels, effective in the frequency range of interest.
The ETC show early energy above -20 dB. Identify reflections arriving within 15-20 ms (relative to direct) and absorb or redirect this energy. What you decide to do with the energy arriving after about 15 ms or so, depends on the desired acoustic response.
How I solve this? Bass Traps (Rockwool)? Where?
How to identify those reflections?
Desired Acoustic Response? Should I choose?

Here is a plan I made... (proportions aren't too accurate)

Need help to tune my control room. (First Measures Included)-nw8.jpg
Tomorrow I'll post some pics.
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Quote:
Originally Posted by Alejandro Varela View Post
I have drywall (15 cm from brick with fiberglass between them) with a very slim carpet sticked. At Left, I have Double glass window to look at recording Rooms. Right side, nothing. At front there's a permanent closed window with a heavy drop curtain. At rear three closet doors (that sure need treatment) and the Control entry door. Ceiling has floating fiberglass panels. The floor has floating wood and the whole room its in a a floating stand, made of wood and filled with sand. And as I told you after, two Bass traps (near 1 mt each one) at speaker' s corner.
Nice to know, for what I understand you have 15cm of rockwool in the walls? Just posting to say that I envy your decay times (*without sub engaged) , very controlled down to 32hz (do you really need this sub?)

And of course, you need treatment for early reflections.
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Quote:
Originally Posted by ciro View Post
Nice to know, for what I understand you have 15cm of rockwool in the walls? Just posting to say that I envy your decay times (*without sub engaged) , very controlled down to 32hz (do you really need this sub?)

And of course, you need treatment for early reflections.
No I have Brick, air, fiberglass, air and drywall.
Not sure about the sub, but sometimes it's really useful. I had bought it since my earlier studio (it was bigger) and it sounds amazing to me but I put at half volume in this new one.

Finally, What I need to put on my walls? Rockwool Bass Trap? 2? Where you suggest?
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Quote:
Originally Posted by Alejandro Varela View Post
Thanx Glenn. So I begin to put Rockwool as I saw in videos?
That would be correct. Corners are going to give you the biggest bang for the buck up front.
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Quote:
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That would be correct. Corners are going to give you the biggest bang for the buck up front.
OK, I am beginning!!!!!!!!!!!!!
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Hallo..
To take those modal resonaces won't work below 100Hz with absorbtion, you need huge depth to take 19Hz resonance. Install some absobtions and do some measurements before and after and see for yourself. It will only effect 100Hz and above.

Last edited by Mctwins; 10th December 2012 at 01:53 PM.. Reason: spelling
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Quote:
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Hallo..
To take those modal resonaces won't work below 100Hz with absorbtion, you need huge depth to take 19Hz resonance. Install some absobtions and do some measurements before and after and see for yourself. It will only effect 100Hz and above.
Thank you Mctwins
So, what I need to reduced those 19 Hz?
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Quote:
Originally Posted by Mctwins View Post
Hallo..
To take those modal resonaces won't work below 100Hz with absorbtion, you need huge depth to take 19Hz resonance. Install some absobtions and do some measurements before and after and see for yourself. It will only effect 100Hz and above.
I don't understand exactly what you are trying to say here, but I hope the OP knows that MLV and VPR traps will work well below 100 Hz at a depth I do not consider to be "huge". There actually are options other than Helmholtz.
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Alejandro Varela
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I' m going insane! Too much information!!!!!
I'm buying Rockwool panels in this size:
1 x 1 x 0.1 mts with 100Kg/cm density, are this OK?
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