If you have enough Asperin ......

Has .... at home.
No, Seriously.
I have this HS yesterday extensively tested, and I must honestly say, less than 5 minutes after I had joined it, started the headaches.
I thought about until it was the weather, but if you provide all the background noise from, you will notice a hardly perceptible, humming, and within half an hour, after I had taken the HS, disappeared headache, and I have taken no Asperin ,

Furthermore, the cable NEN good meter shorter than the PX21, the earcups are way too small, the strap too tight and the sound guys, you never have a good HS on the ears had, or here why write all the Sound was class?
Seriously, just compare the PX21 and the P11 to stay now times from the manufacturer (because there is still a long way from better HS's) notice and you will, that the sound of the P11 sound too tinny, too many highs again and virtually has no bass.
Oh, the chat is the only positive thing about this HS because of is really good .....

So I can definitely not confirm that the P11 is technically identical to the PX21, except for the missing possibility of connection to the 360, which was also the main reason for my purchase.
But as it looks then I'll grab but rather back to the PX21.

From my side, absolutely no purchase recommendation!