Cubase track level to mixer level adds unknown 3db boost

I wrote all of that to explain why it is NOT an attack on you, just in case you felt it was. I did NOT say you’re not entitled to ask the question.

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Thank you for your clarification. And great answer to the actual question.
I have always understood these type forums are existing for information to be delivered and then pondered from different angles so the added value will be generated 20 years later for some one (or 2000 of them ) encountering the answer thread. So in that perspective you cannot know what is the level of the random interested person in the future who is part of the hugely larger audience than at the time of the initial question asked. My humble opinion is that it is not so much about who is asking what but just to shed light on the matter in high quality manner- without added negative which is always heavy to read later. I usually don’t even read the threads with such a totally unnecessary burden. I just cannot take it. But you can think differently of course and enjoy the exitement of the drama.
What comes to this:

That is exactly my point and reason why I turned out to ask the question. My method is to use setup without any plugin between Cubse track and the hardware output and set all stages to 0 dBFS on the way. That is what I call unity gain chain. I noticed there is that 3db difference with two of the meters and decided to ask why that might be. Now I have good idea because of those who answered the question . As I told when developing and testing reamp outboard equipment to be aware of the maximum unclipped voltage range is important. I think maybe I need to start new thread with something like “what is you actual DA output voltage span vs. manufacturer specification given Cubase signal chain at unity gain” as I have created some documentation( Excel sheet for dBFS to different voltage levels given a reference voltage) and corresponding data which can be published for those four DA interfaces I have.
That question would combine two aspects: Pan laws inside Cubase and datasheet verification of the manufacturer DA levels. It should be pure info focused to be easily read 20 years after audience being anyone doing reamping and developing reamp equipment.
As a byproduct - because of the pan law is in the core of all this - there can be parallel sidethread about how people manage recording and susequently interfacing guitar signal to different types of channel and output configurations. Johnny Moneto already showed in his graphical answer the way how that section is supposed to be handled.

Here is two versions of a excel sheet giving DA output voltage values corresponding to DAW dBFS readings. One is for RMS measured with multimeter and other for Vpp shown by oscilloscope.

RMS Example: