George hifi makes a lot of sense with what he keeps bringing up that as long as you can run the DACs volume high enough to prevent bit stripping the only thing a preamp can do is degrade the signal.Not just me saying it, but in so many words also Nelson Pass, if you to use a passive pre to pre-set the level, if the digital volume is too low and "bit stripping", then it can be used in the top 1/3rd if you pre-set the level with the passive pre.
Nelson Pass: On Passive preamps
"What could be better? Hardly any noise or distortion added by these simple passive parts. No feedback, no worrying about what type of capacitors – just musical perfection.
And yet there are guys out there who don’t care for the result. “It sucks the life out of the music”, is a commonly heard refrain (really - I’m being serious here!). Maybe they are reacting psychologically to the need to turn the volume control up compared to an active preamp."
Cheers George