Problem with sub calibration

Artem-zab

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Preamp, Processor or Receiver
Receiver Audiocontrol AVR-7
Universal / Blu-ray / CD Player
Oppo-203
Front Speakers
M&K MP150
Center Channel Speaker
M&K MP150
Surround Speakers
M&K S150T
Surround Back Speakers
M&K Sur55
Front Height Speakers
M&K IC95
Rear Height Speakers
M&K IC95
Subwoofers
M&K W12
Hello! I have receiver Audiocontrol AVR-7 and M&k speakers. I make a measurements in REW Wizard for calibration by Umik 1. And i dont understand, why If I measure Left and Right channels the bass Level is 80 db, and if i measure Center, Surround Right or Surround Left the Bass Level is 84 db?????? Where does the discrepancy of 4 db come from???? With Dirac or with no Dirac the results are the same.
Why receiver add 4 db???????
If I use the channel level, the bass level remains where it was. In the photo, I just leveled the volume of the speakers with the channel level, but the LFE channel remains at the same level.
 

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