Wow, this is really news. I did not know this. I was seriously considering buying it. In fact, I have never heard this happen with any earphones/HP. I have heard stories of HP drivers getting screwed due to faulty amps, and sudden increases in volume, etc. But this is crazy. Did they recall a batch or something? Even one person encountering it is severe. Till now, I had only heard 'not enough base' complaints.
I really hope you did not face it again with P1.
Update - I read this statement from another user who got it replaced.
" .. The new set does not have the same shock problem (I tested using the standard headphone out on the Emotiva BasX A-100 and it works great now..."
So, it is something that can be Quality Controlled. One Tin company rep was defending the 'shock' issue. Not a good sign, though I wonder if the amps have any responsibility to give clear cut guidelines. I remember a heated discussion about an amp firing up HPs too much (forgot the context. I will search for that).
Pls excuse the long rant. I was taken aback reading your message :).