Quote:
Originally Posted by Mixary 
the distance to my speaker is about 140 cm and the real ear level is 114 cm.
in this position the dip is at 135 hz. the dip is very close but very deep ( from 120 to 150 HZ and 15 db max at 135 hz.
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140cm between them gives a null at 135hz
However there are too many variables for this to be that simple surely? Arrival times of reflections will answer the question as to whether it is a reflection from the floor