Redesign small control room
Posted: Sun Mar 28, 2021 4:36 am
Hey,
First post for me, I'm very happy to join the forum
I’m currently trying to improve my control room acoustic, every advice would be greatly appreciated !
Long story short : 4 month ago I downloaded REW, worst mistake of my life
Here are some pictures (sorry for the poor quality) Control Room size:
Length : 4.53m
Width : 2.43m
Height : 2.25m
The control room has already been treated by an acoustician:
Treatment already in place:
- Lower half of front wall -> 7.5cm rock wool cover with fabric
- Top half of front wall -> resonator
- Ceiling -> 7.5cm rock wool cover with fabric
- Rear wall -> 3 resonators
- Side walls -> nothing except fleece and fabric (I added GIK acoustic basstraps at first reflection points)
Here are the REW files (every treatments in place except GIK panels) : https://www.dropbox.com/s/z9cgqgfn3fot1 ... .mdat?dl=0
Distance front wall / listening position : 1.72m (38%)
Distance between monitors : 1.6m
End of equilateral triangle 30cm behind my head at 2.02m from frontwall
Objectives list would be:
Reduce 80hz - 150hz null
Get all first reflections under -20Dbfs
Reduce decay time below 132hz
Problems identified:
- No side walls treatment
- Ceiling treatment too thin
- Front wall resonator not effective
- Front wall porous treatment too thin
- The 2 big rear wall resonators shows up in ETC
After investigation:
It looks like most of my problems come from SBIR and side walls reflections:
.Keeping the listening position and putting the speaker in the corner (front wall/right wall) did reduce a lot of the null.
.Putting Gik acoustic soffit basstraps all around the speaker did reduce a lot of the null.
.Treating whole sidewalls with soffit basstraps did also reduce the null but I can't live with 40cm basstraps on each side and 15cm panels weren't deep enough.
I removed the porous treatments from the ceiling and the lower half of the front wall.
I don't think that 7.5cm rock wool will do anything to sbir or mods ...
I'm also gonna remove the resonator from the top of the front wall, construction is not sealed correctly and design is weird:
2.5cm thick slat, 9cm air, 7.5cm rock wool, too much air and not in the right place no ?
I'm happy with the 2 big resonators at the rear wall (60cm deep, 40cm of rock wool inside) (still they do screw ETC shape a bit)
Front of the room right now: About the walls:
The floor is a parquet which I ignore construction details (not treated for sure).
Front and rear walls are made of layers of breeze blocks + plasterboards (hard but not that much).
Ceiling is hard.
Left wall is made of 6 cm plasterboards.
The right wall is supposed to be soundproof it has a window and a door who leads to a small rec room.
The design looks like : 2 * 1.6 cm OSB glued - 9 cm Air - 1.6 cm OSB. Sadly it has been poorly made : I'm not an expert but I don't think this is the right way seal a wall Anyway isn't the sound going to pass through the parquet even if this was nicely done ?
Possible solutions ?:
I don't mind that the wall which leads to rec room is not really soundproof as I don't use it anyway.
So if it's possible I would prefer not to bother about it.
Without thinking about construction details what I have in mind is:
- Transform the entire front wall in a huge damped broadband resonator, something like this: -Treat the 30cm of the ceiling just above/behind the speaker with damped broadband resonator, something like this : -Treat the ceiling above listening position with 15cm of porous absorber
-Treat side walls with same type of broadband resonator except at first reflections points where I'll put 15cm of porous absorber
I'm gonna update my post with a sketchup file of what I plan to do, but I still have to work on it (First time on sketchup)
Any contributions will help
First post for me, I'm very happy to join the forum
I’m currently trying to improve my control room acoustic, every advice would be greatly appreciated !
Long story short : 4 month ago I downloaded REW, worst mistake of my life
Here are some pictures (sorry for the poor quality) Control Room size:
Length : 4.53m
Width : 2.43m
Height : 2.25m
The control room has already been treated by an acoustician:
Treatment already in place:
- Lower half of front wall -> 7.5cm rock wool cover with fabric
- Top half of front wall -> resonator
- Ceiling -> 7.5cm rock wool cover with fabric
- Rear wall -> 3 resonators
- Side walls -> nothing except fleece and fabric (I added GIK acoustic basstraps at first reflection points)
Here are the REW files (every treatments in place except GIK panels) : https://www.dropbox.com/s/z9cgqgfn3fot1 ... .mdat?dl=0
Distance front wall / listening position : 1.72m (38%)
Distance between monitors : 1.6m
End of equilateral triangle 30cm behind my head at 2.02m from frontwall
Objectives list would be:
Reduce 80hz - 150hz null
Get all first reflections under -20Dbfs
Reduce decay time below 132hz
Problems identified:
- No side walls treatment
- Ceiling treatment too thin
- Front wall resonator not effective
- Front wall porous treatment too thin
- The 2 big rear wall resonators shows up in ETC
After investigation:
It looks like most of my problems come from SBIR and side walls reflections:
.Keeping the listening position and putting the speaker in the corner (front wall/right wall) did reduce a lot of the null.
.Putting Gik acoustic soffit basstraps all around the speaker did reduce a lot of the null.
.Treating whole sidewalls with soffit basstraps did also reduce the null but I can't live with 40cm basstraps on each side and 15cm panels weren't deep enough.
I removed the porous treatments from the ceiling and the lower half of the front wall.
I don't think that 7.5cm rock wool will do anything to sbir or mods ...
I'm also gonna remove the resonator from the top of the front wall, construction is not sealed correctly and design is weird:
2.5cm thick slat, 9cm air, 7.5cm rock wool, too much air and not in the right place no ?
I'm happy with the 2 big resonators at the rear wall (60cm deep, 40cm of rock wool inside) (still they do screw ETC shape a bit)
Front of the room right now: About the walls:
The floor is a parquet which I ignore construction details (not treated for sure).
Front and rear walls are made of layers of breeze blocks + plasterboards (hard but not that much).
Ceiling is hard.
Left wall is made of 6 cm plasterboards.
The right wall is supposed to be soundproof it has a window and a door who leads to a small rec room.
The design looks like : 2 * 1.6 cm OSB glued - 9 cm Air - 1.6 cm OSB. Sadly it has been poorly made : I'm not an expert but I don't think this is the right way seal a wall Anyway isn't the sound going to pass through the parquet even if this was nicely done ?
Possible solutions ?:
I don't mind that the wall which leads to rec room is not really soundproof as I don't use it anyway.
So if it's possible I would prefer not to bother about it.
Without thinking about construction details what I have in mind is:
- Transform the entire front wall in a huge damped broadband resonator, something like this: -Treat the 30cm of the ceiling just above/behind the speaker with damped broadband resonator, something like this : -Treat the ceiling above listening position with 15cm of porous absorber
-Treat side walls with same type of broadband resonator except at first reflections points where I'll put 15cm of porous absorber
I'm gonna update my post with a sketchup file of what I plan to do, but I still have to work on it (First time on sketchup)
Any contributions will help