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Old 25th August 2019
I measured with a smartphone app the loudness of the 134 Hz room mode and wrote the number into this plot. Does anyone can figure out what kind of mode that is? I think a good place for the traps is also behind the table as the loudness is quite large at this position. It also gets weaker when I go downward at the listening position (X) or when I move backwards. The right side of the room seems to be uncritical.

Height / cm dB
100 74
90 73
80 71
70 64
60 45

Before I placed the traps the maximum was at the corners. This is now a lot better. I'll order stands now.

Thanks for all the help and comments.