@ditusa that's a lot of knobs to adjust:-) That's not a criticism. Too many for me as a newbie though!Concerning noisy opamps - I can only speak from my limited experience. My API is dead silent.Nary a click or hiss.There's no issue having it stacked on my dac or preamp either.
I know that Schiit admits to experiencing noise issues with the Lokius and recommends to keep it isolated from other components.