I think the input impedance on your amp/preamp has to be quite high to match the output impedance of the dackit. It doesn't have anything to do with voltage output as far as I know. I have the dackit and hooked it up to an amp with 22k input impedance with no problem.
New Nixon Dac question...
On their website...they claim system matching is important...and works best with systems up 20k...what does this mean? And the phase issues have been addressed with the newer model...correct?