EQ, Loudness and B/T can toggle on/off at Remote (B/T), (EQ), (LD) button.
The RME Dac Menu, At the unit Press (I/O), then turn Knob (2) you will see "Settings", "Parametric EQ", "Bass/Treble", and "Loudness".

EQ, Loudness et B/T peuvent être activés/désactivés à l'aide des boutons Remote (B/T), (EQ), (LD).
Menu RME Dac, Sur l'unité, appuyez sur (I/O), puis tournez le bouton (2), vous verrez "Settings", "Parametric EQ", "Bass/Treble", et "Loudness".

Do not understand what you mean at Question 2.

Je ne comprends pas ce que vous voulez dire à la question 2.

Hi again Eric.

I'm truly not certain what your question really is. (?)

While B/T, and Dynamic Loudness both have an effect on FR, they work in very different ways.  Either function can be negated by simply deactivating Loudness via the I/O menu, or setting your B/T to Zero via the small encoders (1&2) on the front panel of your RME.

I say aloud that outside of a Lab Test scenario,  neither "tweak" is even remotely acceptable to me as both B/T, and Loudness perform very useful functions that I am not willing to sacrifice.   

*example:  My old DAC had NONE of the RME's functionalities.   Devoid of any "features", and by Audiophile Reasoning,  the old DAC Should have been as Pure as the New Fallen Snow, but that was hardly the case.  Now since years, that old DAC lies in a Box stored in the attic never to be heard from again. From a Listeners perspective, the RME outperforms it from every conceivable angle.

Curt

ok and what is the point of bypassing it?

Eric,

On Topic...

DSD is extremely piggish on Resources, and demands that some functionalities be omitted when DSD is played.  All this for no actual increase in performance. This would be just one of the reasons I don't/won't use DSD.

Curt