I think it's a bit unfair to sneer at the man.
- The cable is not too expensive
- It does have slightly better performance
- It may work for less well designed amp and noisy environment (if "cable interference" is true as the man said)
- for example, usb isolator improve 28dB THD when using topping D10s with Intel NUC, if you use state of art DAC with less noisy USB port I think you can't observe any difference
Meanwhile, amir is happy to recommend a
$1499 DAC (SINAD 120) that objectively has no audible difference to a
$139 DAC (SINAD 118).
Why not do a null test and claim the $1499 DAC doesn't improve sound quality at all?
I would like to see more objective measurement result and less "show" like this.