Maybe I'll ask here, because this is a pretty specific question to ADI-2 DAC. What volume levels (dBu and actual vol) do you guys use when going into a separate amp? I have the Auto Ref Level "ON" using an EC ZDT jr. amp. Obviously my objective is optimal input volume for the amp: loud enough, but without distortion etc. ZDT Jr. specs state the input voltage as 0.25–2 V. Right now I'm using +7dBu from the ADI-2 with the ZDT Jr. vol pot @ 9-10 o'clock using my HD800. Cheers!