From Chris at Audyssey:
It might be worth checking out.
Managing gains and digital headroom related to processing boost/processing sound modes etc., is a different thing than what you seemed (unless I misunderstood your point) to imply in your original post#15, that if the levels were increased to above 0, the volume control's maximum would be affected, i.e. decrease accordingly in order to avoid overloading, preserve headroom etc.... I would agree that there are some similarities in principle though.
I don't know about other brands but I have owned enough D&M AVRs/AVPs to know that they don't work that way.
For D&Ms, the level settings
do not (DSP does as you quoted..
) affect the volume control's maximum.
If you own one of those SR6011 or a newer model, or equivalent Denon's, you can do you own experiment by increasing the levels by say 5 dB, and then turn the volume up to maximum. You will find that in direct, pure direct mode, it will go to 98, or +18. Now change the level adjustments to say 10 dB (be careful though so you don't blow your speakers),and then turn the volume to maximum again, and you will see that it still goes to 98 or +18, that is, the absolute maximum.
Note: For this experiment, make sure you are using digital inputs only, with no analog selected on the input assign menu, and preferably no physically connected analog inputs.
Now if you engage Audyssey and processing sound modes such as DTS Neural:X, Dolby surround etc., then yes the unit may impose a maximum limit that is below the absolute maximum limit. How close it can get to the absolute maximum of 98 or +18, would depends on the processing mode selected. For stereo, it may still get to 98/+18, for direct/pure direct, definitely 98/+18. Reasons for such behaviors are likely as explained in what you quoted in post#18 from Chris Kyriakakis of Audyssey.