MoFi 888 making me mad!

Worth noting that break-in times for new speakers can vary widely but amount of time played and volume played at are always two key variables that go into it.  Amplifier used can also make a difference in that some amps may work a speaker much harder than others.

Saying it takes a certain period of time alone for a speaker to break in is meaningless.  Based on what?  Some may even sound their best right out of the box.  

It all depends.

To quote the head monk from the Kung Fu tv series, “ Patience Grasshopper, patience”. 😌
Enjoy the music. 

I had the same experience with my SF Il Cremonese. Out of the box they were nice but were restricted in their low end range and dynamics. A massive difference after a few weeks of run time - in extension, smoothness and dynamic ease. 

Bought a pair of Dynaudio last year. Same experience. Was initially disappointed. Talked the store owner and he recommended 300 hours of break in period. Thought 100 hours would do. Nope. It took 300 hours to get the full performance. Very pleased now!

I had Borresen X2 that took about 300 hours to sound balanced and stop causing ear fatigue. Now I have the X3, and they also took more than 300 hours to show their capabilities (Borresen indicates 100% at 500 hours), but the X3 were absolutely better than the X2 right out of the box. The best thing to do is be very patient, not judge, and wait for them to balance out.