A truly good design should not be altered by a connector.
ahhh....no
The connector should not add coloration.
such a connector does not exist
That is what the Eichmanns do (nothing)and nothing is good
I would be interested in the various ic's that you have made to determine this. Conductor, dielectric, geometry, shielding, solder etc because in my experience everything effects the sound including the Eichmanns and I have made quite a few cables in my time...