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Author Topic: Resonator Type  (Read 7499 times)

Ethan Winer

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Re: Resonator Type
« Reply #15 on: February 16, 2009, 01:40:58 pm »

Steve Hudson wrote on Mon, 16 February 2009 10:39

We installed two large (6'x4') traps with 6" of 703 and a five inch air gap between the 703 and the rear wall. Would we get better l.f. trapping by eliminating the air gap and installing 4 more inches of 703?


A single gap as you describe is good, and the difference after filling the gap would be minimal. Yes, it will help a little! But only a little. Much better would be to apply the extra four inches of 703 on the outside of the panel. Then the absorption is 10 inches thick, and the air gap helps even more.

--Ethan

Steve Hudson

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Re: Resonator Type
« Reply #16 on: February 16, 2009, 02:24:32 pm »

Thanks, Ethan. We'd have to rebuild the frames if we were to add panels to the front of the existing ones.
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Thomas Jouanjean

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Re: Resonator Type
« Reply #17 on: February 16, 2009, 03:41:12 pm »

Bruno Gouveia wrote on Mon, 16 February 2009 09:27

Can you describe more about Sylomer or Merformer?


Good example of application using Sylomer:

http://recforums.prosoundweb.com/index.php/mv/msg/24611/0/0/ 19234/

Bench design system applied to decoupling the whole studio shell, from under 10Hz.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Thomas Jouanjean

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Re: Resonator Type
« Reply #18 on: February 16, 2009, 03:47:45 pm »

Bruno Gouveia wrote on Mon, 16 February 2009 09:22


He uses Arkobel or something similar attached with screws to conglomerate or MDF panels that are mounted in an array normally in the back wall of the control room. I've been at two studios designed by him here in Porto, but I think he has more. I think you can spot the array at the map at this site: http://boomstudios.pt

But of course everything you said makes perfect sense and Newel is also a man of science so he obviously uses the techniques you described!


Thanks for the details! Interesting technique...

Nice studio! Variable acoustics in the LR Smile

Though visible ceiling in CR seems quite low for a room that size, do you happen to know which height... 2.60m, 2.70?

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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Greg Reierson

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Re: Resonator Type
« Reply #19 on: February 16, 2009, 05:45:49 pm »

Thanks Dana! I almost forgot about the thread...

Thomas Jouanjean wrote on Mon, 16 February 2009 05:36

I had a look at your website - can you describe what is between you diffusor's back and the studio shell? Any LF treatment in there?


The empty wells on the back side of the diffusor are filled with fiberglass. The diffusor itself is directly in front of the rear wall which is two layers of 5/8" gyp board on metal studs about 24 IOC, 6" space with fiberglass, then another two layers of 5/8" gyp board.Looking back I wish I had build something into that wall. It's still an option. Just need to know what direction to take.

Quote:

Sounds to me like you should find a designer to design an upgrade to clean up the LF problem properly.


That will be my next step. I just want to understand the problem a bit better beforehand.

Thanks,


GR
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Bruno Gouveia

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Re: Resonator Type
« Reply #20 on: February 17, 2009, 04:00:37 am »

Thomas Jouanjean wrote on Mon, 16 February 2009




Nice studio! Variable acoustics in the LR Smile

Though visible ceiling in CR seems quite low for a room that size, do you happen to know which height... 2.60m, 2.70?




Yes, maximum 2,80m to the cloth. There's office spaces above. Also there is a big hollow space for Newel's loudspeakers that aren't installed, and that space re-emits... Also the room is so dry that only at the sweet spot you can hear something really happening.  But the live room is great, 110m

andrebrito

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Re: Resonator Type
« Reply #21 on: February 17, 2009, 08:27:05 am »

Behind the 2.80 m there's over 1 m of rockwool I have been told
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Greg Reierson

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Re: Resonator Type
« Reply #22 on: February 19, 2009, 04:35:11 pm »

Thomas Jouanjean wrote on Sun, 15 February 2009 02:55

Pics would help...

Sounds to me resonators are not what you need. You need porous absorbers and membranes. Resonators placed just out there in the room would re-emit too much.


I'm a bit confused by that. When are resonators appropriate?


GR
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Thomas Jouanjean

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Re: Resonator Type
« Reply #23 on: February 19, 2009, 05:21:08 pm »

Greg Reierson wrote on Thu, 19 February 2009 15:35


I'm a bit confused by that. When are resonators appropriate?


GR


When there are no other options. They're usually buried deep in the room structure, behind the rest of the treatment.
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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Greg Reierson

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Re: Resonator Type
« Reply #24 on: March 23, 2009, 08:05:33 pm »

Progress report:

After taking everyone's comments into consideration I decided to tackle my back wall. I have the luxury of not needing to contain the LF in my room. Low end leakage doesn't bother anyone and there is no significant source of LF outside of the room to bother me. I removed the inner gyp board wall and added a huge amount of porous trapping above and to the sides of my rear diffusor. The combination of more LF leakage and trapping (the trap is now about 5' deep at its deepest point above the rear diff) has made a huge difference. The 60Hz bump is gone and the 105Hz bump is much better. No resonators needed!

The next step was to work on speaker placement optimization. With all of the LF changes, the apparent LF in the room was decreased. I assume the modal ringing of the room had been creating a false sense LF power, even though I knew it wasn't right. Now that the ring is gone, the LF is more even, but not as well reinforces as before.

Small speaker placement moves can make surprisingly large responses changes. After a few hours of moving the big PMCs a couple inches at a time, I found what seems to be the flattest LF response with the fewest peaks and dips. The RPlusD software (the update to ETF5) made the process of comparing many speaker locations a snap. If you need a measurement tool but don't need to make a career out of it, RPlusD seems to have everything you need.

I've been listening all day and I have to say I'm extremely happy with the results of a weekend's work. Thanks to everyone who encouraged me to do it the right way!


GR





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Thomas Jouanjean

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Re: Resonator Type
« Reply #25 on: March 24, 2009, 09:31:19 am »

Excellent!  Smile
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Thomas Jouanjean
Northward Acoustics - Engineering and Designs
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franman

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Re: Resonator Type
« Reply #26 on: March 25, 2009, 10:28:21 pm »

Awesome.. glad to hear it!
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