Stehno -
I do believe that more organized, relaxed crystal structure can reduce sibilance. I actually just started offering a cable I call the "Perfect Crystal" (marketing talk), which eliminates most of the smll sibilance that my "standard" cables had. However, I'm sure that you can damage even single-crystal wire by working it or temp-shocking it. Single-crystal wire must be handled carefully after it is fabricated or you will wreck it. For instance, if you were to twist several small gauges of single-crystal into a stranded wire, working the metal like this would cause it to be no longer single-crystal. It would definitely break it up into smaller crystals, with the resulting sibilance.
It's hard to believe that crystal structure in a power cord would make much difference, particularly given that there is usually far more ROMEX in the wall that has relatively crappy crystal structure, but you evidently have the empirical evidence on this. I wonder how much of the sibilance reduction was actually due to the improved grounding or ground-filtering provided by the conditioner as opposed to the current-carrying wires? If the sibilance is due to ground-loop noise, then this could explain it. The power Hot and neutral wires do not really explain it, IMO. Another experiment, where you unground the amps at the wall outlets or at the conditioner using cheater plugs would tell you if it is a ground-loop causing the sibilance.
I do believe that more organized, relaxed crystal structure can reduce sibilance. I actually just started offering a cable I call the "Perfect Crystal" (marketing talk), which eliminates most of the smll sibilance that my "standard" cables had. However, I'm sure that you can damage even single-crystal wire by working it or temp-shocking it. Single-crystal wire must be handled carefully after it is fabricated or you will wreck it. For instance, if you were to twist several small gauges of single-crystal into a stranded wire, working the metal like this would cause it to be no longer single-crystal. It would definitely break it up into smaller crystals, with the resulting sibilance.
It's hard to believe that crystal structure in a power cord would make much difference, particularly given that there is usually far more ROMEX in the wall that has relatively crappy crystal structure, but you evidently have the empirical evidence on this. I wonder how much of the sibilance reduction was actually due to the improved grounding or ground-filtering provided by the conditioner as opposed to the current-carrying wires? If the sibilance is due to ground-loop noise, then this could explain it. The power Hot and neutral wires do not really explain it, IMO. Another experiment, where you unground the amps at the wall outlets or at the conditioner using cheater plugs would tell you if it is a ground-loop causing the sibilance.