This may not be the correct forum for this, but I use these headphones with my 500X, so I'll start here.
I've purchased TWO (2) pairs of Tascam TH‑200X headphones during the last 18 months and the jack crapped out on BOTH of them. Is there a history of this happening? Is there something with the 500X phones output that could be causing this? I really love the headphones otherwise, but I don't think I can buy another pair of these if it's just going to happen again.
If I push the plug in the entire way the sound is distorted and sounds like aliens are talking. The only way to get any intelligible sound is when I plug it in partially, but then I can get either only the LEFT or RIGHT channel of sound, never both, depending how far the jack is inserted into the unit.
Also, there is no longer any stereo separation in the speakers, everything sounds mono (same in both ears), even though it's only the left or right channel coming through from the source.
I have tried the phones in different sources and same results, so it doesn't seem to be the 500X phones jack.
I'm probably going to cut off the old jack and solder a new one and see what happens, can't be much worse than how they're working now.
I've sent a message to Tascam about this, so we'll see what they have to say.
Thanks for your time.