This is concerning. If properly constructed, speakers do not need 600 hours of break-in. An hour or two at most. If the sound is still changing after 600 hours then it is unlikely the design has any stability or reliability to begin with and you can expect ongoing change for practically the life of ownership.
What is more likely to happen is that you will get acclimatized to the new sound over such an extended period.
Honestly, either you need to see an audiologist or there is something faulty with your new speakers or setup. Your speakers are world class - you should not be experiencing these issues.
What is more likely to happen is that you will get acclimatized to the new sound over such an extended period.
Honestly, either you need to see an audiologist or there is something faulty with your new speakers or setup. Your speakers are world class - you should not be experiencing these issues.