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serko70

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  1. Ok I understand. I was talking about consumer brand AVRs which are always inbetween during measurements and I found this solution to see the correct sub response and adjust its volume with the rest of the system. But it's a fact that Dolby LFE channel is boosted by 10dB by specification to dramatize the effects recorded solely for that .1 channel (and there are not many of them) When the sub also acts as a crossed over part of speakers, it's volume will be 10dB too high. I guess because you XO them below audible range, you don't hear that: https://www.dolby.com/uploadedFiles/Assets/US/Doc/Professional/38_LFE.pdf
  2. Were you sending sine sweep directly to the sub without an Atmos decoding receiver inbetween? What I am saying (or rather trying to) is, that's not the sub's actual response or else all speaker responses would jump by 10dB below their XO points. That's the response when you measure through the LFE channel which is boosted by 10dB. My suggestion avoids that during measurements and then of course you change LFE setting back to 0dB at the end of the calibration.
  3. In this graph, the subwoofer response looks like it's 10dB higher than the rest of the system. That's because LFE channel is boosted by 10dB according to Dolby Atmos spec in the receiver's decoder. You could avoid that during measurements by adjusting the LFE parameter as below in the receiver:
  4. I am afraid your room is too small ie shorter than the wave length of 77Hz (3.88 metres). Room equalization won't help you. A null occurs when sound waves meet their own reflections 180 degrees out of phase. It's a physical phenomenon for which there is no electronic cure. Bass traps down to these frequencies have to be very large (not convenient in a small room). A Helmholtz resonator is the only solution, and even that wouldn't fix the problem completely(you can hang them from the ceiling to save space). Also try changing your sitting position to the geometrical centre of the room. However if you still want to play around with room EQ the link below is an excellent source. There's some detailed information on how to use JRiver with REW and also some close-micing measurement techniques by using HOLM(also free) which has frequency dependent windowing feature which REW lacks: https://yabb.jriver.com/interact/index.php?topic=87538.0
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