how can I measure the polarity (wrong or good) of chassis with REW ?
I measure in a distance of one meter in front of the chassis with the 0 ° Calibrationfile of microphon.
If you mean the drive unit polarity, you can get an indication from the direction of the impulse response when the display is set to % (not to dB). It can be tricky though if you are measuring a speaker with multiple drive units.
You have plotted the envelopes, those won't help as they are always positive. It is the impulse response you need to look at, which is the first trace in the Impulse Response graph.
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