[chips2481]

I figure first contact is left positive and second contact is right positive. Is third contact left ground and fourth right ground?

 

[randytsuch]

I use
R- is tip
R+ first ring
L+ 2nd ring
L- sleeve

That's the Astell and Kern wiring, which seems to be the de facto standard.

But I have seen other ways to do it too.

Randy

 

[chips2481]

So just like this?
https://robrobinette.com/images/Audio/Fiio_2.5mm_Balanced_Pinout.png
I also see this on the page I am looking at.
https://robrobinette.com/images/Audio/TRRS_Balanced_Headphone_Pinout.jpg

https://robrobinette.com/BalancedCable.htm

 

[randytsuch]

So just like this?
https://robrobinette.com/images/Audio/Fiio_2.5mm_Balanced_Pinout.png
I also see this on the page I am looking at.
https://robrobinette.com/images/Audio/TRRS_Balanced_Headphone_Pinout.jpg

https://robrobinette.com/BalancedCable.htm

Like the first one.
Works with my fiio and earstudio Bluetooth adapter.

 

[chips2481]

Thanks

 

[randytsuch]

NP
Those little 2.5mm trrs jacks can be a pain to solder.
Good luck
Randy

 

[chips2481]

Thanks again. I will post some pics when I am done.

 

[chips2481]

Success!