Speaker burn-in is just a myth. Your brain adapts with new speaker sound and you either feel it is better or worse over time, but the sound does not change.Thanks for help!
I bought one today at a special confidential price that was so good I nearly fell off my chair. In reality, all these speakers in the store are overpriced by 2-3 times, so the cheapest and best option will always be DIY if the requirements are high, but I don't have such high requirements.
And also, I've read elsewhere that these speakers will sound good with time, the manufacturer also recommends it, so maybe many people sell new ones because they think they don't sound good or they bought them at half price and now they're making money, including without paying VAT. I don't know, just a guess.
Enjoy your new speakers anyway!