Can speakers sound worse during break-in period?

There not Vintage one generation back. They’re a pr the company never sold and offered them to a dealer at a special discount. 

Here’s a progress report on my speakers break-in process. I’m happy to report after 100hrs ( XLO burn in disc track 9 ) things have improved. They’re starting to open up, driver integration is better and sounding much fuller. They still need more hrs on them but things are starting sound very good.
hiendmmoe

To all the naysayers I must say I’m sorry your mind is made up and if it can’t be measured on paper it doesn’t exist. I let my ears tell me what the truth is not a set of numbers that try to explain why it’s impossible to hear something if it can’t be measured. I started this post asking a basic question and have now answered that question: yes speakers do go through changes during a break-in process and do sound worse before they get better and better. I’ve now put close to 125 hrs on them and it’s a night and day difference from the first 25 hrs. They have come alive in a way that gives no regret or cause to wish I never bought them. They are the best speakers I’ve ever owned!!!!