Originally Posted by borrego
Unlike through hole circuit board, solder used on surface mount circuit are for fixation purpose rather than conducting purpose. The component on surface mount circuit board can make direct metal to metal contact to the board trace. Actually the less solder used the better.
The solder is mainly for conduction, with a secondary purpose of also fixing it to the copper trace. Theoretically, everything makes a difference, from the thickness and quality of the copper trace, to the amount and kind of solder. Solder is a material, just like wire, that the electrical signal needs to flow through. The potential impact of solder is even greater than a change of the wire to a headphone, as it will affect the signal right at the source, on the MB where the signal is being processed. Low lead/high silver content can have a major impact. Look up Kondo, from Audio Note, who makes his own output transformers with pure silver wire, wires the amp with pure silver, and very high silver/low lead solder. He makes his own capacitors using silver or gold foil. The commercial silver wire is not good enough, so he makes his own wire, from pure silver, slow drawn through the die, at low temperature, to create very long crystalline structures in the wire.
I mention the above mainly to give an example of an extreme attention to detail. But his results are not in question, that his attention to detail gives a result that people who have listened to it, are willing to pay $100k for an amp, and wait in line for it to be hand assembled.
And the above is a round about way of saying that the silver solder could make a difference. Let's see what the users say, when they get a copy to compare with. Personally, I'm expecting that there will be a difference, even if it is only better solder, and a manufacturing line that has extreme attention to quality. Having seen what a difference to small detail can do, I am a believer in the differences that a high quality assembly line, run by perfectionists, could make.
Whether it is worth the extra cost, that is up to each individual to decide. Just like we currently do for changes in wiring, DACs, amps, headphones, etc. Nothing new, actually. Some people believe that amps, wires, AC cables, etc., do not make any difference. And some believe that everything makes a difference. I'm in the latter camp.
But to each his own. And leave the others to their happy delusions.