I know this has been discussed before but I am
a bit puzzled at why some personal earphones work with my 1/4in mono to 3.5mm stereo jack and others do not. I have a set of Bose QC20s that work great with this arrangement but I have a couple of pairs of JBL and Sony earbuds that don't work with the latter only working if you turn the volume on the audio control panel to max.
I fly a 777 if it helps.
Thanks