Ih the old horn loaded days, you'd have to really aim your PA as to not directly hit direct reflected surfaces which would create awful problems.
Nowadays with DSP's and Digital everything, you can do it all electronically. Amazing how you manipulate sound these days.
... and that's why I became a Sound guy. That 'rush' almost every day of the week. Some of the biggest and best systems on the planet. Doesn't get better than that! :)
No voice coil is bullet proof. You thrash 'em, they overheat.
Think of electric radiators. The more volts, the more they WILL glow...
It usually happens just as you're thinking ".... that's the best I've ever heard them." That's when they die.
You just have to back off that 10%.
Once you've...
Breaking in speakers is purely argumentative. I like the sound of fresh speakers. Just use 'em as you normally would.
Eventually your ear will get used to 'em anyway regardless how new or old they are. No big deal.