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Sennheiser Momentum Balanced Mod

post #1 of 78
Thread Starter 

In anticipation of an incoming CEntrance HifiM8, I decided to switch to a balanced cable for my portable of choice, the Sennheiser Momentum.


Only problem is that there is a TRS 2.5mm jack on only one side, so while making a new cable is a breeze, it wouldn't be balanced.  Since I didn't want to risk marring the looks of the Momentums by drilling to each driver, I decided to see what I could do to the jack.  I wasn't thinking tutorial, so I only have a couple pictures, but the great news is that the 2.5mm jack is mounted to a PCB that is easily unscrewed from the driver and can be easily de-soldered if you have a solder pump.  Once the 2.5mm jack is removed, you have 4 very convenient places to solder the new cable to, including separate grounds (they were joined inside the jack, not on the PCB).  All in all, ended up being easier than I thought it was going to be due to the extremely convenient PCB.


Here is a picture of the board with the 2.5mm jack already removed:



Here is the back of the board after soldering wires to it:



Ready to solder the drivers back onto the board (that is hotglue on the board used for strain relief while braiding the cable):



Finished with a mini-XLR:


post #2 of 78
Very nice! Now all I need is for someone to mod the earcups to a larger size,
post #3 of 78

Is there anything holding down the new cable other than the compression from the cup?

post #4 of 78
Thread Starter 
The board is screwed down, hotglue at the solder joints as well as a little on the heatshrink where it hits the cup.  Other than that, all compression (which is considerable).

Oh, and the board is through-hole instead of surface mount so there is a little more security from that as well.
Edited by FraGGleR - 5/23/13 at 4:40pm
post #5 of 78
Originally Posted by FraGGleR View Post



beautiful cable/headphones!

post #6 of 78

Cool !

post #7 of 78

Hey, congrats on the front page!

post #8 of 78
Thread Starter 

Thanks, all!

post #9 of 78

Excellent info. I was thinking about doing something similar with my Beyerdynamic DT1350 to combine it with my incoming M8 as well bigsmile_face.gif


One question, does the M8 actually take a mini XLR ? I thought the options available are only regular sized XLR or do you plan to use an adapter? 

post #10 of 78
Thread Starter 
No. As much as I wish the M8 was going to have a mini XLR option, this is so I can use a set of adapters that I made already.
post #11 of 78

That's what I thought and I completely understand your preference.  I wish as well that the mini XLR option would be available for us to choose. Anyway, excellent mod and indeed very helpful. 

post #12 of 78

I would love to make an adapter set like that, except it's friggin impossible to find mini-xlrs in Canada, much less than 4-pin ones. 

post #13 of 78

What was your choice of cable?

post #14 of 78
I love the idea of doing this to mine but am not feeling brave enough lol
post #15 of 78

ph34r.gif That might have just sold me on the Momentum. Except I have no DIY experience tongue.gif

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