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I have a pair of M-100 headphones with the a broken internal cable (cut in the external portion from the speaker to headband) Can you help me find a replacement and show how to replace it? thanks a lot!

I don’t have problema with soldering and test negative and positive cables. Just need to find an online store that sella that type of reinforced cable…

I doubt if this can be repaired on your own. Yes, you can ask for replacement if the product has replacement guarantee etc.