I think you might of already mentioned it, but what amp are you using?At volume 30 my Adam monitors are already at a very high level.
Just got my new NCx500 Audiophonics amp and am pondering gain settings with the DL200. I set the buffer gain to 19db (default is 25). Finding that volume level at 45 is about my normal max listening level. More comfortable around 35 on the dac volume. I am fairly confident the basic operation of the DL200 and D-6s is the same.
Might need to buckle up and order the D-6S and wait out a shipment from China. I would like a smaller dac that I could put on top of the amp. The DL200 is wide.