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Old 17th August 2020
Originally Posted by schlorian View Post

In the new measurements I measured from 20-20khz and also did multiple Mic Positions for one Speaker position. The Dip at 70Hz changed a bit in deepness and frequency. I also measured the Distance from the right speaker to the right wall, and it's 122cm, which could be the cause of the SBIR in my opinion.

What confuses me is that you can also clearly see a dip in this frequency region in the measurement which went diagonally through the Room. Maybe multiple Effects on top of eachother?

Thanks guys!
best regards,

You can see in the new measurements that dip between 69hz-74hz is moving which is SBIR( also when you look at excess Group delay/minimum phase it shows the deep null in all of them). The only way to correct is to treat all the boundaries that are affecting it( sometimes this means you have to treat all of them except the ceiling).