What I can tell you is that I replaced the stock umbilical in my ModWright Sony HAPZ1-ES and it made a stunning improvement. More than any other PC or IC replacement I ever tried. It was like a component upgrade. I had one made for me by Audio Magic. It was one of their Liquid Air designs, which I believe are no longer available. Like anything else, this is always going to be a hit or miss deal. The only way to know is to try it.
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