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acoustic treatment for a small live room
Old 17th March 2019 | Show parent
  #91
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ReDRuMx's Avatar
Very interesting thread.

Could someone post their own ACTUAL measurements of rooms treated with HH devices?

Please
Old 17th March 2019 | Show parent
  #92
Gear Head
 

Quote:
Originally Posted by Jens Eklund View Post


300 mm deep HH array incident angle from Soundflow.

One panel has 6 mm gaps and the other one 7 mm gaps between the slats. So even if you mess up by this much; the performance is almost identical. There is no precision required to build a HH array.
How big in order it has an impact on my room ? 150cm X 60 on the rear wall ?

Thanks in advance.

G21
Old 19th March 2019 | Show parent
  #93
Gear Head
 

Quote:
Originally Posted by JayPee View Post
No. Alpharock is way too dense for SSC.
Reading is the key. I found out the correct GFR for SCC. Below 15 is the key. Below 10 better.

Still computing informations...
Old 22nd March 2019
  #94
Gear Head
 

Hello

I retrieved some stuff.

Now there are only 4 SCC made of ISOVER 26kg/m3 - GFR 15

Sorry i did the measurement with the 2 HP all together.

Next : First reflections.
Attached Thumbnails
acoustic treatment for a small live room-4_scc.jpg   acoustic treatment for a small live room-vide_empty.jpg  
Old 25th March 2019 | Show parent
  #95
Gear Head
 

Hello

I followed the advice given by Jens. I built a sealed trap with slats, 6/7 mm slits, 90 cm slats. 30 CM Rockwool Rockmur. Back is closed.

Size is 139X64X30

I placed it on the front wall. It lays on the ground, That's the only room i have for this trap.

acoustic treatment for a small live room-hh_en_place.jpg

Just above this trap, i have room for 20 cm. I'm going to stack 2 traps of 20CM deep, made of 2 sheets of Rockwool RockPlus (50Kg - GFR about 15)

Am i on the good track ?
Attached Thumbnails
acoustic treatment for a small live room-hh_en_place.jpg  
Old 26th March 2019 | Show parent
  #96
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Jens Eklund's Avatar
 

Quote:
Originally Posted by golgoth21 View Post
I followed the advice given by Jens.
?

I have not provided you with any recommendations. The example posted earlier was only to demonstrate a point in a side discussion.

Also; you don’t add treatment where “there´s space”: you add treatment on relevant surfaces (and hopefully there´s space to do so on these surfaces). If your modal issue is related to a pair (or all 4) walls; treating the floor will have little or no impact:

Need help to tune my control room. (First Measures Included)

And finally; even if related to the floor (and ceiling): treating a very limited area when the issue is related to possibly the entire ceiling/floor area, will most likely do close to nothing.
Old 26th March 2019 | Show parent
  #97
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Jens Eklund's Avatar
 

… But looking at your waterfall plots and realizing that the time scale is different on the before and after graphs; you actually improved the situation surprisingly considering the very small area treated and not even on a related surface area (for about 50 Hz) if panel is lying on the floor …

I´d say your room is good enough to benefit from 2 subs and a DSP to be able to correct the low end (and to be able to x-over above possible floor related SBIR dip in the 110-170 Hz or so range) with decent results.
Old 27th March 2019 | Show parent
  #98
Gear Head
 

Quote:
Originally Posted by Jens Eklund View Post
… But looking at your waterfall plots and realizing that the time scale is different on the before and after graphs; you actually improved the situation surprisingly considering the very small area treated and not even on a related surface area (for about 50 Hz) if panel is lying on the floor …

I´d say your room is good enough to benefit from 2 subs and a DSP to be able to correct the low end (and to be able to x-over above possible floor related SBIR dip in the 110-170 Hz or so range) with decent results.
Hello, thank you.

The pannel is laying horizontally on the floor. Its face is looking at the opposite wall, not at the ceiling.

I ve added 20 CM of rockwool 50kg, GFR around 15, on the wall, above the pannel mentionned earlier, up to the ceiling.

And i ve added 10 CM of rockwool 50 Kg / GFR on the first reflections spots (side walls and ceiling).

Here is what i have now : It's much better. Except this huge dip at 1KHz. I'm looking for what to do. Moving the cloud, moving the speakers, retrieving the thick carpets.

Next step : i will add a non-woven polypropylene fabric on some of the pannels (not the first reflections); in order to rise the decay up.

acoustic treatment for a small live room-waterfall_complete.jpg

acoustic treatment for a small live room-termine_spectro.jpg

acoustic treatment for a small live room-complete_avant_apres2.jpg


acoustic treatment for a small live room-fir_complete.jpg
Attached Thumbnails
acoustic treatment for a small live room-waterfall_complete.jpg   acoustic treatment for a small live room-topt_complete.jpg   acoustic treatment for a small live room-spl_complete.jpg   acoustic treatment for a small live room-fir_complete.jpg   acoustic treatment for a small live room-complete_avant_apres2.jpg  

acoustic treatment for a small live room-termine_spectro.jpg  
Old 31st March 2019
  #99
Gear Maniac
 
Buggaluggs's Avatar
Don't want to de-rail the thread, but, what (how) are you using to get the spectrum analysis? I have a clean slate room I am about to start on and this looks like a great tool to get me going in the right direction.
Old 31st March 2019 | Show parent
  #100
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Quote:
Originally Posted by Buggaluggs View Post
Don't want to de-rail the thread, but, what (how) are you using to get the spectrum analysis? I have a clean slate room I am about to start on and this looks like a great tool to get me going in the right direction.
REW:

John Sayers' Recording Studio Design Forum •

View topic - How to use REW to analyze the acoustics of your room...
.
Old 2nd April 2019 | Show parent
  #101
Gear Head
 

Okay, i learned so much these past weeks (months).

Here are my last REW.

I have in my room : 4 Corners traps (SCC) made of Isover 26kg/m3 GFR around 15. The front corners are covered with a 100 g/m2 non-woven polypropylene fabric

I've built a front wall made of a 30 cm deep slated box (60CM high X 135 Large),
rockwool around 26 kg/m3 GFR close to 9.

Above there is a 20 CM deep absorber, Rockwool 50Kg/m3 GFR around 13/14. 120 CM High X 135 Large), the fabric is a 70 g/m2 non-woven polypropylene.

I'm still building the first reflections traps. They will be 20 cm deep. 50 kg/m3 GFR around 13/14. One on each side (mirror trick)

The last REW is better (i guess, and so to my ears). Even if the waterfall shows highs looking like a comb shell.

Before
acoustic treatment for a small live room-vide_empty2.jpg

So far
acoustic treatment for a small live room-waterfall_300319.jpg
My room is closed to the street. REW looks better late in the evening (night)


Before
acoustic treatment for a small live room-spectrogramme_vide.jpg


So far
acoustic treatment for a small live room-spectro_310319.jpg


Before/After
acoustic treatment for a small live room-rt_topt.jpg


I hope First reflections traps will improve something. In fact, i'm thinking about the axial width mode at 120Hz.

The door is located almost in the middle of the lenght of the longest wall. I'm thinking about hooking a trap on the door, in order to kill this 120Hz mode.

I'm thinking about a trap on the backwall, for the first reflections. I don't know if it needs to be 20 CM deeps. It will be hooked above the piano. I don't know if it is smart to do so.


Pictures next.
Attached Thumbnails
acoustic treatment for a small live room-spectrogramme_vide.jpg   acoustic treatment for a small live room-spl.jpg   acoustic treatment for a small live room-vide_empty2.jpg   acoustic treatment for a small live room-rt_topt.jpg   acoustic treatment for a small live room-spectro_310319.jpg  

acoustic treatment for a small live room-waterfall_300319.jpg  
Old 2nd April 2019 | Show parent
  #102
Gear Head
 

Me again.

On various threads about first reflections i read the depth should be up to 6inch.

What about 8 inch ?

4 inch, so far, did not show much improvement.

Bye.

[EDIT] I found out : Quick question; 50mm or 100mm rockwool for reflection points? [EDIT]
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