I thought 400 hours seemed a bit extreme. More than one person has said they change character a few times until they’ve fully run in and that you need to ‘be patient’. I’ll let you know if experience that phenomenaTakes about 10 hours for the speakers and an unknown amount of time for your brain to adjust to the new sound.
400 hours means you really loved your old system.
i’m running Room Perfect with the subs tomorrow or Saturday so they should sound even better after that.