Post by toffermann on Feb 28, 2017 16:00:05 GMT
Hi guys,
over the course of the last few weeks I've tried to collect as much information as possible from all sorts of forums and videos and I found this forum especially helpful, so I decided to ask you guys for help with my room treatment project.
The room I'm using is 3,43 m (11,25 ft) wide, 4,64 m (15,22 ft) long and 3,19 m (10,47 ft) high.
It is a room I'm renting that was used as a rehearsal space before, therefore it was constructed with a room-in-room principle.
On top of that there were already some wooden panels placed in all wall-to-wall corners, lined with a thin layer of rockwool (about 2,5 inches).
After first listening tests we discovered that the room suffered from flutter echoes and severe bass frequency nulls in the listening position. We listened to some house/techno tracks, because this is what we are intending to mix in this room. All along the center line between the monitors there was so much bass cancellation that all of the reference tracks sounded pretty much awful. So we decided to build some broadband absorbers, the basic design of which are wooden frames with different thicknesses of rockwool inside.
This is the frequency response at the listening position before treatment:
all our panels are constructed with a wooden frame 125 cm x 60 cm (50 inches x 24 inches) and the following depths:
- 4 deep panels with 30 cm (11,8 inches) depth, of which 22 cm (8,7 inches) are filled with rockwool
- 8 medium panels with 20 cm (7,9 inches) depth, of which 14 cm (5,5 inches) are filled with rockwool
- 2 shallow panels (for early reflections): 10 cm (4 inches) of depth, of wich 7 cm (2,8 inches) are filled with rockwool
As you can see, we left out some space between the insulation and the wall hoping for better efficiency in the bass frequencies.
We used isover Akustic tp1 insulation sheets, which the manufacturer labels with an estimated flow resistance of >6000 kPa*s/m²
This is how we placed the panels:
view on the rear wall (the deep panels are placed in the top corners):
view on the front wall (during measuring the speakers were placed accurately in an equilateral triangle in the middle of the room):
this is supposed to take care of early reflections on the ceiling (one of the medium panels):
Furthermore used the leftovers of insulation to add another layer of wool behind the brown corner panels.
We were excited in expectation of the results, but after testing we didn't see the improvements we expected to achieve (especially regarding the bass cancellation).
These are the results, measured at the same listening position (Note: I think we accidentally measured with a slightly louder overall volume (maybe a few dB)).
After treatment:
vs. Before:
As you can see, there is not much improvement at all in the frequency response, which also showed in our subjective listening tests (still sounded awful
)
We saw improvements in reverberation time though:
Before:
After:
But this doesn't change the fact that the room is still unusable for monitoring.
This was a huge letdown and we were kind of sad that it didn't help at all... so we hope that you guys can give help or an opinion from a better informed point of view. Maybe you have some tips on what to do next or how we should change our setup.
At the moment we are also wondering if it is at all feasible to achieve a flat bass response in our room (because of the nearly square dimensions).
Thanks in advance for reading and for all the help you are providing for the community in general!
Cheers,
Felix
over the course of the last few weeks I've tried to collect as much information as possible from all sorts of forums and videos and I found this forum especially helpful, so I decided to ask you guys for help with my room treatment project.
The room I'm using is 3,43 m (11,25 ft) wide, 4,64 m (15,22 ft) long and 3,19 m (10,47 ft) high.
It is a room I'm renting that was used as a rehearsal space before, therefore it was constructed with a room-in-room principle.
On top of that there were already some wooden panels placed in all wall-to-wall corners, lined with a thin layer of rockwool (about 2,5 inches).
After first listening tests we discovered that the room suffered from flutter echoes and severe bass frequency nulls in the listening position. We listened to some house/techno tracks, because this is what we are intending to mix in this room. All along the center line between the monitors there was so much bass cancellation that all of the reference tracks sounded pretty much awful. So we decided to build some broadband absorbers, the basic design of which are wooden frames with different thicknesses of rockwool inside.
This is the frequency response at the listening position before treatment:
all our panels are constructed with a wooden frame 125 cm x 60 cm (50 inches x 24 inches) and the following depths:
- 4 deep panels with 30 cm (11,8 inches) depth, of which 22 cm (8,7 inches) are filled with rockwool
- 8 medium panels with 20 cm (7,9 inches) depth, of which 14 cm (5,5 inches) are filled with rockwool
- 2 shallow panels (for early reflections): 10 cm (4 inches) of depth, of wich 7 cm (2,8 inches) are filled with rockwool
As you can see, we left out some space between the insulation and the wall hoping for better efficiency in the bass frequencies.
We used isover Akustic tp1 insulation sheets, which the manufacturer labels with an estimated flow resistance of >6000 kPa*s/m²
This is how we placed the panels:
view on the rear wall (the deep panels are placed in the top corners):
view on the front wall (during measuring the speakers were placed accurately in an equilateral triangle in the middle of the room):
this is supposed to take care of early reflections on the ceiling (one of the medium panels):
Furthermore used the leftovers of insulation to add another layer of wool behind the brown corner panels.
We were excited in expectation of the results, but after testing we didn't see the improvements we expected to achieve (especially regarding the bass cancellation).
These are the results, measured at the same listening position (Note: I think we accidentally measured with a slightly louder overall volume (maybe a few dB)).
After treatment:
vs. Before:
As you can see, there is not much improvement at all in the frequency response, which also showed in our subjective listening tests (still sounded awful
)We saw improvements in reverberation time though:
Before:
After:
But this doesn't change the fact that the room is still unusable for monitoring.
This was a huge letdown and we were kind of sad that it didn't help at all... so we hope that you guys can give help or an opinion from a better informed point of view. Maybe you have some tips on what to do next or how we should change our setup.
At the moment we are also wondering if it is at all feasible to achieve a flat bass response in our room (because of the nearly square dimensions).
Thanks in advance for reading and for all the help you are providing for the community in general!
Cheers,
Felix
