The sound out of my right earphone does not always work when I use the coupler. Sometimes there is no sound and sometimes the sound is less than the left earphone. I have to rotate/turn/twist my earphones in the coupler until I find a connection that produces sound in my right earphone. I have tested the coupler with a few other things and the same thing happened. However, when I use my earphones and other cords without the coupler, they work fine. Given that it seems I can find a position that does work after some twisting, I’m going to continue using it.