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Atmos null at 1270 khz on audyssey editor app

Hi I ran the audyssey editor app on my denon avr x6500h and noticed that for every atmos speaker being measured, there is a large null at around 1150 kHz (topic is wrong) of about -15 to -20db. I have 4 in ceiling speakers for atmos and all read the same. What am I missing here and how can I improve this? These are focal and BW speakers.
jwl244
russ69's avatar
russ69
3,504 posts
 
That sounds like a room issue or a measurement equipment issue. It's hard to boost a null.  
jwl244 OP
64 posts
 
Russ. I'm not sure. I have a drop ceiling and the speakers are installed in the grids that way. I measure using the auddesey app and the included mic on a tripod.  I just find it strange all 4 have the same type of reading. My other speakers do not show this null at all. Is this just the way atmos channels measure? Are these reflections off the ceiling itself interfering with the direct sound?
russ69's avatar
russ69
3,504 posts
 
"...Are these reflections off the ceiling itself interfering with the direct sound?..."

Sounds like a reasonable theory.   
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