robertmsThis might sound weird, but try sucking on the side that sounds low with your mouth, my right side did this and I suspected a driver had caved in, turns out it worked and now both work the same again. Hope this helps.
JulianCSound in the right ear was getting faint. Actually bought a new cable to replace the original and no difference. Bought the KZ ZS10 Pro to replace them.
Just saw this and tried it and now it works fine.
Of course now my GF who saw me try this thinks I have an ear wax fetish...