Test Setup
Room dimensions: L x W x H: 3.45 m x 3.05 m x 2.44 m
Modal peaks (calculated using REW): 49.7 Hz, 99.5 Hz, 112.4 Hz, 122.5 Hz, 180 Hz
Nulls: 95.1 Hz, 103.4 Hz, 132.8 Hz, 168.6 Hz
Microphone placed 1 m from the LXmini speaker, at the height of the full range driver, pointing to the driver center.
Comparisons
Comparing measurement done by Acourate + "Amplitude Preparation" macro (FDW) with default parameters with REW:
Conclusion: the FDW algorithm of Acourate gets rid of reflections and smoothes out the FR curve a bit.
Comparing the FR measured by Acourate with free field measurements from SL's page. Again, the measurement done by Acourate was processed using FDW with default parameters. In order to be able to match graph image sizes, I exported the impulse response into WAV and loaded it into REW as Acourate doesn't allow to resize its window.
This is a simple overlay done in a graphical editor. The Acourate measurement is non-highlighted red line:
This is a simple overlay done in a graphical editor. The Acourate measurement is non-highlighted red line:
As we can see, 0 deg free field response is straight, while Acourate's 0 deg response is inclined. I think, it must include sound from other directions.
Something similar to free field response can be obtaining by gating the IR measured by Acourate (using Cut'N'Window function with rectangular window). Here is the result imported into REW and smoothed by 1/12 octave (blue):
Something similar to free field response can be obtaining by gating the IR measured by Acourate (using Cut'N'Window function with rectangular window). Here is the result imported into REW and smoothed by 1/12 octave (blue):
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