I know that burn-in and break-in are contested issues, but solid state electronics operates differently (better) when properly warmed up. Data sheets for devices like chips and transistors show plots of temp vs distortion, etc, so even the engineers that work for the companies that make the poarts know this for fact.
So, in order to avoid what nay-sayers call 'brain burn-in" I always try to run the gear for an hour or at least 30 minutes, then do a quick listen, make the change- do a quick listen, then let it play for 30 minutes or so more, then listen again, so it is not me adjusting to a new sound.
The important thing is to not lossen the connectors and sockets by changing out connections 'too often'. Origninally mmcx and 2-pin were incorporated into iem designs, so if a cable 'broke' it was user-replacable, rather than having to send the iems to the 'hospital' for surgery....
So, in order to avoid what nay-sayers call 'brain burn-in" I always try to run the gear for an hour or at least 30 minutes, then do a quick listen, make the change- do a quick listen, then let it play for 30 minutes or so more, then listen again, so it is not me adjusting to a new sound.
The important thing is to not lossen the connectors and sockets by changing out connections 'too often'. Origninally mmcx and 2-pin were incorporated into iem designs, so if a cable 'broke' it was user-replacable, rather than having to send the iems to the 'hospital' for surgery....