This is why I only got a B in Electromagnetic Waves undergrad.
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@roberjerman - Yes banana plugs, not jacks , sorry.
@others - Maybe we should leave this topic - I think we won't come to a right conclusion on this one. It's not just that I am a bored musician and came up with something insane - it's simply something with Cable specifications I think. I have no clue why changing or isolating anything an the back of the terminals changes SQ - I think it is unsolvable in this case. At the beginning I thought that the speakers have very instable impedance shifts but I got no clue why isolating ends of the cable improves that. Thank you anyway.
"In the stereo application with cinch plugs, new problems arise with the spatial separation of the ground leads (L / R) of the 2 cables, which do not exist with the 5-pin DIN connector with a ground pin and common screen for both channels. If the cables are apart, the ground lines form a loop, into which foreign alternating magnetic fields, e.g., hum, or causing high frequency interference. "
>>>> A few days ago I cut a small 5 cm piece of sticking tape and wrapped it around tight on of the "+" banana jack on the cable ( upper part of the banana jack other 3 jacks are untouched ) then I inserted this jack into the banana terminal in speakers ( they are monitor speakers with biwirable links - all posts are gold plated ) -<<<<
People don't realize that plastics in contact with the metal can alter the sound. Its how the Ground Zero tweaks work with a controlled effect. It seems you got your own version of this thing at work...
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