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?
The 600s have a badly designed connector where the cable attaches to the body of the headphone. Remove it and put it back in and the problem will probably go away. Hell, even wiggleing it may make it work correctly.
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.
Even with the Cardas cable, the connectors are the same, give it a try, take them out and put them back. It's free!