My whole experience in hi fi tells me completely different. An example i had my jumper cables naca5 replaced wit pro airlocked ones te same naca5 cable and the sound definately improved, not a massive one but the bass and instrrument seperation was definately better. I also had my naca5 proffessionally soldered with the sa8 amp plugs and wow wat an improvement you wouldnt believe just a bit of the right solder with the right nickel
I beg to differ as ive had many improvements in SQ over the years. and some better than others. From gettin naca5 jumpers airlocked where the bass and instrument seperation showed an improvement, to buying an olsen pdu were there was a distinct improvement over the previous pdu. Getting the naca5 cable proffessionally soldered with sa8 amp plugs was a wow moment though. Just a bit of nickel with the correct solder and properly done will show the difference between what can be acieved with the right attention to detail in hi fi. Read about the many wow moments and the many previously deep sceptics been converted regarding the so many methhods of upraded sq be it a cable, a dac, a power plug, a different connector. spike pucks, isolation. Theres so many ways to improve sq and they dont have to cost much either.