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how can I check if my headphonesspeakers are damaged?

Hello everyone,

I have recently bought a pair of Beyerdynamic DT 770 PRO 80 Ohm, but I noticed that the jack on the audiocard has some DC, and sometimes while keeping the volume high the sound distorted.
Then I plugged my headphones into the mixer to avoid the DC problem, but how can I know if I damaged them already even if the exposition to DC has been just for some days?

Should I mix with my crappy headphones, or crappy speakers?

Well, I don't think my speakers are "crappy" really, but I don't think they're meant for audio recording either.

Headphones: Cheap wraparound the head ones that were popular about 6 years ago.

Speakers: Logitech z4, cost me about $70. Sound great for movies!

Don't really have the money OR the space for something else right now