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Ran a YPAO setup on my new Yamaha 673 and when finished I used a sound pressure meter to check how accurate calibration was.In my 7.0 system all speakers were very close except the back surrounds which were lower by a few levels.Should I raise them up to be at same level as other speakers based on sound pressure calibration or has Yamaha set them lower in its YPAO calibration for a reason?