Should I eliminate my preamp?

Using a passive I know in my case that there is a real noticeable difference when I go from a 1 meter cable to a half of meter cable. I has a fuller more complete sound when I use a half a meter cable no matter which the five brands I have to try.

Nice post George.  You figured out all the specs of my system. And as I put my system together I tried to do as much of that as I could.  I wondered about capacitance of my cables, input sensitivity of my amp and so on. I think it payed off.
The dac I use in my main system is a moon 300d. It has a bigger power supply than the 100d I use to use. I did not have that on my virtual system. I just went on their and updated it since you mentioned it. Thanks.
Now the sound I hear is not a night and day difference. But easily noticeable for me, which means it may not be for someone else not familiar with my system. The difference for me was in not just hearing the music but feeling it a little more. I think it is the actual air pressure. Like when a vocalist gets their mouth close to a mic and you feel the air pressure of their voice a little more through the sound system that is being used. And I am talking about just a little more. Anyway I think people would enjoy a passive more if they make a passive friendly system.  Maybe my experience doing this help's someone a little.

That is real possible. Thanks