I'm going to explain this the best I can but I'm experiencing a clicking/popping noise in only the left earphone on 2 pairs of PowerBeats Pro's. The noise happens when I move the left earphone in and out from my ears with the large tips, which I prefer since the smaller ones don't create a seal which degrades the sound quality. The noise is also not from the audio, but seems to be something physically with the earphones such as the speaker diaphragm. I thought maybe it's my ears, but I put the left earphone in my right ear and it makes the same noise there. The right earphone does not make the same noise on either side with the same size tips. And I even tried swapping the tips to the other sides and same thing, only left earphone makes the noise. So I've isolated this to the left earphone only and not my ears. You may be thinking why I'm moving the earphones in and out, right? Well I noticed this when I'd press the button on only the left side and started playing around to figure out what was going on. The noise is enough to be bothersome when I'm pressing on the button to change songs and answer/end calls. Other than this I'm happy with the earphones but wondering if anyone else is experiencing the same, even though I wasn't able to find any other reports of this same thing.