Lack of bass / audio distortion using headphone socket

I have a strange problem with an iPhone 5 I repaired. When I opened it I found the glass that had been broken on the front had severed the cable here:

http://img27.imageshack.us/img27/9793/h6...

I bought a new dock assembly which included a new earphone socket but this cable was not attached. Does anyone know what it does?

The phone is now working but when I listen to audio through the headphone socket there are problems such as severe lack of bass. It makes songs sound totally different from normal.

I have restored the iPhone to 6.1.4 so it shouldn't be a software problem, equaliser is off.

Thanks

Answer this question I have this problem too

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2 Comments:

Just found out it is the bluetooth bracket so is unrelated to my issue, I will test another part in there.

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Replaced the dock assembly with another one and it fixed the problem, was a faulty replacement part.

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