Hangers for control room design - Suggestions

[aparolin]

Hello from Italy .
Here is my plan for the control room in my house.
Room dimensions: W: 5.20 L. 3.30 H. 320 and it's made by solid tuff brick.
Superchunk it's a rockwool 225 - 7cm (75kg/m).
I still have to design and build the hangers, the ceiling and the basstrap for the wall. After I'll think about the door construction.
My questions is :
1. hangers placement make sense?
2. I think to lower the ceiling ( 50 cm framing with 7 cm of fiberglass) only for the half of the room space.It' a good idea?
3. Worth narrow left and right walls to improve the response of the room?
I have attached the sktechup file and a pic of the room and the room mode.
Thanks


mode
1 32.98 Hz C1 1-0-0 ax
2 51.97 Hz G1# 0-1-0 ax
3 53.59 Hz A1 0-0-1 ax
4 61.55 Hz B1 1-1-0 tan
5 62.93 Hz B1 1-0-1 tan
6 65.96 Hz C2 2-0-0 ax

[aparolin]

Another question is about fiberglass tickess for the hangers.
Can someone help me?

[aparolin]

Is there anybody out there?

[rockindad]

FYI - There's a whole thread here...

http://johnlsayers.com/phpBB2/viewtopic.php?f=2&t=12365

Scott

[aparolin]

Hi Scott, thanks for the answer.
Very interesting, but I still have not figured out if the hangers in my design can works well!
I have that space measuring 53 cm that I'd use to place hanhers.
What do you think about it?

[FriFlo]

The hangars I built didn't have as much of an impact, as I hoped thy would have. I am not saying, they are bad, but IMO simple porous absorption is way easier to achieve and to predict. The area in the back (or front?) of your room is perfect for just filling it with 50cm of light insulation (e.g. Sonorock). The way you orientated the hangars is wrong anyway, so you would need to angle them, loosing more space. Go with insulation.
But before you will need to plan other things: Your room has a lot of problems. One is asymmetry of the left and right wall. Another is the almost equal height and width (at least in parts of the room). If this is the room you have, I would first decide the orientation of the speakers and your seating position, take multiple measurements with REW to adjust and confirm the best possible orientation (with the least SBIR-problems) and plan the porous absorption roughly. That would be as much basstrapping as possible (corners, back and front of the room), a big ceiling cloud and broadband absorbers to your left and right. Since you don't build a new symmetry in the room with new hard surfaces, you need to reduce the early reflections. You can go for a very thick ceiling cloud, that will also improve the bass response (again, filled with light insulation).
This way, you plan in the right order. Starting with absorbers before you ever took a measurement is wrong. Your modal problems will not be exactly as calculated, as your room is not a perfect cube and the entrance door is glass, if I see that right. So, REW will tell you, what the problems really are. Setting up speakers and microphone takes some time, but is totally worth it! Also, you will be able to compare each step of absorption you take to the empty room.

[aparolin]

Hi , thanks for the answer! Here is a plan
You said 50cmRockwool should work well?

[FriFlo]

Be careful with those statements, because it really matters, what kind of rockwool you choose. i am not an expert on that, but thick absorbers need a lower gas flow resistance ("Längenbezogener Strömungswiderstand" in german) in order to work well for bass frequencies. Sadly, Rockwool has different products with different names in every country around the world! In Germany Sonrock is perfect for this kind of task:
http://www.rockwool.de/produkte/u/1616/ ... u/sonorock
You can look for any rock wool with 5000 - 6000 Pa ∙ s/m². That will work well. Also, IMO the sonorock 10cm deep sheets are pretty good to work with (ok to cut and they have a good stability, so you have to do less work to attach them. They are also quite cheap, if you look for a good offer.
But please stick with my initial and most important hint: figure out how to use REW, experiment with the position of your speakers and seating position (measuring and listening) a lot and give more detailed informations about that here. This is the most important stuff and you should start with it. Then, smoothing out the bass response with rock wool is the easier part, it is just a lot of work ...
And don't forget: The biggest problem might be your ceiling height - room width - ratio! And just generally: The ceiling cloud might be at least as important, as bass absorption in the front and back of the room.
If you are wondering, why you don't get a lot of replies: The experts (I am not one of them!!!) probably expect you to put more work onto learning the basics (maybe reading a book) and investing some time in measuring. They just know, with your attitude (just start building some absorbers and see how it goes) you won't get far, anyway. Believe me! I made the same mistakes myself!

[aparolin]

Ok, thanks

[FriFlo]

Is the last picture the wall, where you want to put your monitors?

[aparolin]

Yes, it is! I'd like to build a bass trap and a wall broadband in the space where you said to put insulation.
What do you think about that way to do it?

[FriFlo]

Not good. Why only a thin sheet of insulation, while you can fill all of those 50cm with light insulation? Works better with bass frequencies. The slot wall doesn't make sense in that space either. It will cause direct reflections of your monitors. You want to prevent that. Just porous absorption being cloth (maybe very thin plastic to keep it dust free). And that goes for all absorbers around your seating position (left, right and front wall).
But first: Do some REW measurement.

[aparolin]

Sorry, I realize that I was unclear , here is a plant of the current situation .
Cheers

[aparolin]

I need help for the empty space you can see. I ordered a measurement microphone , meanwhile I create the plan.
Before your advice , I 'm go with the hunghers, cheeper and easy to build.

[FriFlo]

Current situation? That means you already built that?