Blown up my Sennheiser 600's


I use my Senn 600's for listening to audio and for monitoring through my guitar modeller. Last night the left speaker in the headphones started to get distorted and crackly while listening to the guitar. Is it possible I have blown the speaker? Can it be replaced?
128x128daveyf
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Viridian, Thanks for the advice. Forgot to mention that I run the Cardas headphone cable to the phones and the connector's are pretty solid.
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