That would make sense considering its a all DD set and the Voice coil and suspension need to loosen up "Break In". When I worked for a speaker manufacturer we always had a minimum break in time before we sold any drivers. Also keep in mind in Hybrids and tribrids that the nature of BA and EST drivers don't really break in so much as the DD once lossened up changes its frequently output and effects the overall tonal balance of the entire set thusly "Opening them up".
Musicians know that their
monitor driver needs to be changed after a while in use because the suspension gets too loose and makes sloppy bass.
But same as a brand new driver is very tight and bass is fast but not fully articulated. The Voice coil and capston also sound different after some current is played through and especially with copper VC the sound gets smoother right up to the time you burn the thing LOL!
My 2*