Proper interconnects are 300 ohm, I think.
I have heard 75 and 150 from some manufacturers.
At 3 meters of wire, relative to audio frequency, even up to 40KHz, it shouldn't matter at all by generally accepted calculations.
I have always had decent gear, Dynas of various types, some Hafler, broadcast surplus, and now a JoLida with some cap upgrades.
My scrapbox has had various types of wire from pure silver (JAN surplus silver wire used to be cheap-ish), plated, nearly any gauge of copper, hardlines of various types, uhf low loss coax at 75 ohms, microwave surplus, all manners of twisted-pairs (these I still find noisy), bits and pieces,.... in short, all sorts of stuff.
Needless to say, I have tried all that I could, and in various combinations.
That was back in the days when my hearing tested very well, and I
was able to demonstrate absolute pitch.
I never heard any wire make a significant improvement or degradation, except when unshielded wire caused noise.
These days, my hearing is more acute, but technically failing.
That is, I know more about what to listen for, and what I am hearing, but have less "bio-machinery" to hear it.
I will always keep an open mind, but I would love to see a phase-plot, or something that will show why a piece of wire can be worth so much. Until I hear it, or see something that I can logically connect to a psycho-acoustic difference, I am a doubter.