SOURCE: replacing headphone connector
The impedance or resistance of the two different sets of wires might be different. The higher the impedance the less signal. If your cable is long enough you are better off spending the five or so dollars for a new plug. Red is right, green or blue is left and copper is ground.( Usually) Unfortunately not all manufacturers agree. Also what could have happened is a short between the wires that you soldered.Make sure they are physically separated from each other and insulated.
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: Colors of the wires for CX 400 headphones
i think yellow-green are moveable ground of the volume pots, just
because they are seperated and twisted to reduce noise. seperating,
twisting ground channels, especially connecting them in only one point
near source's ground is the basic rule of simple electronics to achieve
noise reduction. yellow cable is a high impedance side of volume pot and
its hard to get noise when you move pot the yellow side because you're
making speakers to generate lower volume. so its not needed to twist
yellow wire with others. its the possible scheme below,
http://i55.tinypic.com/s612ko.jpg
SOURCE: I have the sennheiser cx
I think this is common problem for headphones. To fix it you will have to solder cord's wires back to plug. If you have tools and some experience you'll be fine
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