I don’t think the actual argument is that all cables sound the same. It’s something that has been parroted so many times that it has become a complete thought. The actual statement is that all cables that measure the same in terms of resistance, inductance and capacitance sound the same. The scientific folks claim that these 3 parameters are all there is, while the subjective people believe there is more than that to it. But it has been proven that large differences in those electrical characteristics can dramatically affect frequency response. Just as one example, high inductance can roll off the highs at audio frequencies.
Audioquest vs Mogami XLR Audio connector cables
I had recently purchased a McIntosh MC152 amp and I used my 6 year old Mogami XLR cables to connect it to my preamp. I decided since there was a 1/2 off on Audioquest Columbia cables to give them a test. I always thought Mogami cables were of good quality and was not sure what to expect with the Audioquest cables that were pure copper as well.
In short there was a more open sound...more clarity with the Audioquest cables in a very good way. Little details were heard better and I have to say I am happy with my choice. I know some say there are no differences, others claim they all sound different, but with my setup, there was an improvement. If I did not like them, I would have returned them. I still have 60 days to decide if I want to keep them but they are staying. 