Keith_W
Major Contributor
Yesterday I decided to look at the effect of having the sofa at the listening position on measurements. This is where the sofa is located:
And without sofa:
These are the measurements. I applied some smoothing to make the measurements more legible:
The mic was not moved from the position between the two measurements, nor were any settings changed. Both measurements were taken before any room correction was applied and before I had volume matched all the drivers (hence the lumpy and uneven looking response). We can see:
- About 2dB more bass with the sofa in position
- The null at 150Hz is almost completely removed by the sofa, but the null at 220Hz is 10dB deeper (both are low Q nulls though)
- There is comb filtering caused by the sofa between 400Hz - 3kHz almost certainly due to reflections from the sofa (as you can see, it is a leather sofa. I suspect that a fabric covered sofa would not be as reflective).
The usual recommendation is to remove any obstacles between the speakers and the mic when doing room correction. However, I have a somewhat silly question - given that the sofa will always be in that position, shouldn't it be part of the measurement?
And without sofa:
These are the measurements. I applied some smoothing to make the measurements more legible:
The mic was not moved from the position between the two measurements, nor were any settings changed. Both measurements were taken before any room correction was applied and before I had volume matched all the drivers (hence the lumpy and uneven looking response). We can see:
- About 2dB more bass with the sofa in position
- The null at 150Hz is almost completely removed by the sofa, but the null at 220Hz is 10dB deeper (both are low Q nulls though)
- There is comb filtering caused by the sofa between 400Hz - 3kHz almost certainly due to reflections from the sofa (as you can see, it is a leather sofa. I suspect that a fabric covered sofa would not be as reflective).
The usual recommendation is to remove any obstacles between the speakers and the mic when doing room correction. However, I have a somewhat silly question - given that the sofa will always be in that position, shouldn't it be part of the measurement?