[Leon83]

I'm attempting to replace a broken jack plug on my Sennheiser CX400 in-ear headphones. But I'm not quite sure about the wiring. The channels aren't separated because I hear sound in the opposite channel when I adjust the balance to left or right.
There are 4 wires. Red, green, copper (ground?) and the last one is red and green.
 
Here's a picture of how it looks at the moment:

 

[Kelstorm]

Hi, I just today had a very similar problem with my CX300II headphones. When I opened the jack up to try and fix the wiring I was confused by this green and red wire. However, I assumed it must be ground because I know green and red are left and right, respectively. I can say that this is definitely the case because having wired both the copper cable and the red/green cable to ground with the red the and green to their respective channels the headphones are working perfectly again
 
tl:dr red/green is another ground.

 

[Leon83]

Thanks alot! I actually didn't expect any response on this one.
 
Ok, so the red/green is actually ground aswell. Will heat up my soldering iron and try it.

 

[Len Slater]

Replace Jack on Sennheiser PX100 IIi (for Iphone)
 
I broke the original jack on these headphones and got a replacement from Maplins, these headphones need a 4 pin jack part No.QT65V 4-Pole Jack Cost £2.19
 
The Green Wire connects to Pin 1 Left Audio.
The Red Wire connects to Pin 2 Right Audio.
 
The Red & Green wire contains inside a White Wire Seperate the Green & Red from the White sheathed wire.
 
Connect the Green & Red along with the other Common (Copper Colour) to Pin 3 Common/Ground
 
The White Wire connects to Pin 4 Microphone.
 
If you dont have the facility to shrink the connections after soldering and testing secure with resin (Araldite).
 
You will find all original functionality works including microphone and volume controlls.
 
 
 
 

 

[drovid]

Hi, I just today had a very similar problem with my CX300II headphones. When I opened the jack up to try and fix the wiring I was confused by this green and red wire. However, I assumed it must be ground because I know green and red are left and right, respectively. I can say that this is definitely the case because having wired both the copper cable and the red/green cable to ground with the red the and green to their respective channels the headphones are working perfectly again

tl:dr red/green is another ground.

So... How do I connect my cx 400 with apple earphone wires? Apple has 2 gold and I have no clue on which one is correct.

 

[hylicon]

Hi!
 
I'm just doing my 880's now and my assumption was that the Red and Yellow are a pair and the Red/Green and Green are a pair. The green strand is just to indicate which of the Red or Yellow this particular ground goes with. Redundant, but having worked for Germans before, I can tell you that this is the type of quality assurance the put into their products.
 
N.