Nope, turning it up all the way takes the Lampi attenuator completely out of the path. the external preamp will then control the volume. The DAC itself already does the amping to whatever the output voltage is. lampi does it with tubes, SS Dacs do this with opamps or diiscrete components. Now your active preamp may add another gainstage, but that cant be avoided by any Dac, AFAIK.