how to check if everything is fine with the headphones?

[Diesel10]

how to check if everything is fine with the headphones?
i ran full volume with hd800s and master 9 amp and i think i caused damage!!!
how do i check if there any damage if i dont remember how did the hd800s sound at the start?
like if i lost any sound quality.
Thanks <3

 

[Diesel10]

Please Help cuz i dont want to send them for repairing if i dont know if i damaged them and then the store will start laughing at me (((

 

[Hifiearspeakers]

https://www.audiocheck.net/soundtests_headphones.php

 

[Diesel10]

https://www.audiocheck.net/soundtests_headphones.php

but does this test the sound quality?