speakers obviously change over time. this is called "wearing out." The fact that after running a speaker for a time it's possible to measure some sort of change is meaningless unless that can be shown to be audible and in the case of burn in as it is used n the audiophile community, beneficial. All these measurements and the only real potentially notable change is apparently a 5hz lowering of the -3db point. Now, that sorta sounds like something right? Oh boy, look at that improvement in bass response! Burn in is real! But, if the response prior to burn in at 57 hz was -3.1db and now after 50hrs of burn in its -2.9dbs is that really significant? I doubt it...and that's assuming it's even really a result of burn in