I did noticed that my 3.5 interconnect (ADL by Furutech ID-35SP before it was with custom cables) sounds "better" when certain side is connected into my dap with the other side connected it sounded a bit "muddy" since then I only connect the "correct side" into the dap.
Was doing it like this for years...
Like what can you say...when you "hear it" ?
edit for the "muddy" and "better":
It might be that this cable is "tuned" because one side gives treble resolution the other one gives soundstage !
tested it today I have no way to do blind test it might be placebo but this is not.
one side = treble
other one=soundstage and treble is tuned down a bit
I don't have any tools to measure but someone with the tool go get this cable but still there might be difference/variation between cables or maybe not who knows?