https://avahifi.com/products/abx-switch-comparator
https://www.dagogo.com/audio-by-van-alstine-abx-comparator-review-part-1-audio-store-wiring/
this is a very useful tool for comparing components or cables (no xlr connections though) ... mine has been very helpful over time
they used to be $999, when i bought mine, prices have certainly gone up... for reasons we can all understand
whether one can hear differences reliably among cables depends on a lot of factors, one’s hearing acuity, resolution of one’s system, what is being connected, and so on... one must really try for oneself to determine if different items make a sonic difference, not just for cables, but anything we try to improve our sound
folks arguing here, asserting their view, is no different than one person insisting their food item ordered is too salty... but will that same item be too salty for me???