Can speakers sound worse during break-in period?

"break in cant be measured its not real"
This statement is a load of crap.  I've been breaking in 4  - 15 inch woofers for about a week.  During that week,  FS has dropped around 3hz, QTS has dropped about .5 which is sizable. Not sure why someone would make such a statement, many other changes,  but break in is clearly measurable and over this time drivers,  all size drivers will make very noticeable changes. Normally the biggest change comes at around 4 hours of running them at decent levels,  it changes little by little until you hear real differences again at around 50 hours and still change on most drivers through 100 hours and I've seen a few speaker take even more. 

@geoffkait  
I would argue that many,  if not most of those things mentioned also change during break in. Of course,  that may or may not be the intent of your post. 

To have a guy that is clueless and argues almost every point under gods creation is one thing,  but to have a guy chime in that calls himself a manufacture that apparently has never taken the time to measure drivers at several points of break in is beyond my comprehension.  FS, QMS, QTS and even LE and RE all change as the motor and suspension break in.  It is threads like this that makes me back off of posting. 

Yes, capacitor break in means.... "more juice"

Actually, a capacitor consists of two or more conductive plates which are not connected or touching each other, they electrically separated either by air or by some form of a good insulating material such as waxed paper, mica, ceramic, plastic or some form of a liquid gel as used in electrolytic capacitors. This insulating layer between a capacitors plates is known as the Dielectric.
The dielectric material can interact with current flow. As the cap is used and voltage is passed, the plates can heat up, which very much affects how the skin affect of different dielectrics and resistance (Z) ESR/ESL of the cap. The signal, like water, will take the path of least resistance. It can even create a temporary magnetic field. Different Dielectrics do react with a hysteresis effect differently to all of this in caps. That why an electrolytic, mylar, polyprop, polycarb, teflon, paper in oil etc, all have a unique sound signature. As all of this stabilizes, the caps do settle in and YES, you hear them settle down as they break in. Another common word for this is the caps are FORMING.

@kenjit 

Here are his speakers, pretty nice stuff. 

https://forum.audiogon.com/discussions/omg-just-removed-my-speaker-grills-and-the-sound-just-opened-up-to-a-n