Thank you, appreciate your checking.

Yeah, would be interesting, thanks.   Last question - when I press the "talk through" button and the room is quiet, the microphone amplification noise is louder in the left ear than in the right. Not by much, but definitely noticeable. Is that true with yours as well or are they perfectly...

Thanks, great to have confirmation. Just curious - any idea why they have the on/off switch for Noisegard in that case? Why not just have the "normal/bypass" switch and have it on when in "normal" mode.   At any rate, good to know it's a documentation issue and that mine aren't defective.

bump... anybody? I know we have a few 450 owners here. Sennheiser is notoriously bad at responding to emails and Amazon was unable to confirm whether or not these are broken. Would really appreciate any guidance on whether mine are defective and should be returned. Thanks in advance.

Hi,   I just got my PXC 450s in the mail today, and found something that doesn't match up with the instruction manual.   The manual states:   To switch off NoiseGard 2.0:  Press the ON/OFF button  approx. 1 second.  The LED  goes out. If NoiseGard is switched off, you can...