SOURCE: My Sennheiser HD 205 suddenly
The two copper wires on your headphones are independent grounds for each channel. Twist them together and attach them to the ground cable ( black) of the new plug. The colored wires of the headphone correspond to the live wires of each channel, and the plug should have the same colors. Wiring together the grounds will not affect in any way the stereo separation, it is just that each ear needs its own ground. Cheaper headsets just transfer the ground from one ear to the other one through the metal headband.
SOURCE: Sennheiser Hd 205 headphones stopped working properly
Although I'm not an expert I'm not quite sure if armadillopic is right. I had the exact same problem and managed to overcome it by replacing the cable from the headphone to the mini-jack plug. I actually only had to renew the last bit of the cable but chose to replace the entire cable. I found out that when I bend the last part of the cable in the exact right position the strange high pitched sound that was going over the vocals went away and the vocals became much louder and clearer like they normally did. Perhaps you can try if this works for you as well? Just bend the last end of the cable in various kinds of positions (NOT TO EXTREME OR YOU WILL ONLY DAMAGE THE CABLE MORE!). Hope you are able to narrow down the problem to just the cable. Greetings!
, and then click Control Panel. In the search box, type Performance Information and Tools, and then, in the list of results, click Performance Information and Tools. 
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.223 views
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