I apologize in advance to all you true believers. I know you are good people for the most part.....but.....
It's soooo ridiculous. This is why audiophiles get so much criticism from the non-audiophiles. If there ever was proof positive that we are a bunch of fools, believing in phatom self delusion, this is it. Equipment racks don't sound different, period. If they seem to sound different, then obviously, your ability to discern differences is impaired or inadequate. Which should also be obviously true.
Equipment racks should be sturdy, functional, and pretty. Done. Find the cheapest one that meets those 3 criteria and it will sound just peachy.