Did you mean to reply to a different comment? What does calibration or 75 dB have to do with anything I said?
The most common experience on the poorly mixed content that several in this thread are complaining about are: the volume setting necessary for intelligible audio results in uncomfortably loud audio in other parts.
This is a defect of the content, not of the system it's playing on.
75 dB in real life is your typical restaurant, office, etc.