@Maurizio, my Italian friend.
Everything affects everything. For the moment I do not know if it was Mao, Konfuzius or me who said this first.
Of course a DAC has an impact on the sound signature. By the way, makes a steerable sound signature bit-perfect not obsolete? I have to think about....
You know that in my personal universe (the one and only universe where I can see me as the centre) the order is different. In that moment I are absolute happy and satisfied with my stereo I certainly have a look if I can better the sound with another DAC. Very often I got the impression people think that a DAC can bring a remarkable higher level. So, you and every other who read my posts during the last weeks know how I think. In the very moment one owns a decent enough stereo he or she could look at DACs. If that is ok then he or she should go for cables. But, as you and I and many others know: Once in that rabbit hole there is no way out. Or you must own a bassotto who shows you a way out.
Never stop seeking!