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Is the meter so erratic that low so it is all garbage?
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Any response information that is below the meter calibration file is not meaningful.
Below that, the falling meter calibration waveform (which is incorrect, since you have C-Weight turned on- it's not extrapolation) is exaggerating the signal that's in the noise and making it appear as though the response down low is good. I'm afraid that it's not though. Uncheck the C-Weight box to help alleviate the problem, or at least don't look at your graphs below the calibration file of the meter.
Here's an impulse response showing the noise about -45dB down and then the subsequent frequency response graph with C-Weight on and C-Weight off.
Note that at about -45dB down from peak, the response appears to rise.... it's bogus.
In both cases though you can see where the signal is actually into the noise because the signal looks like it starts rising. It doesn't really........
RISING LEVEL impulse.jpg
C-Weight checked in REW
RISING LEVEL with c.jpg
C-Weight unchecked in REW
RISING LEVEL no c.jpg
brucek