Hey all - long post - thanks for your patience. Details: iPad 2 16gb 3g + wifi, iOS 5.0.1 So I've invested quite a substantial amount of money to try and put together a mobile demo studio but I'm having an issue with a faint click or pop noise when I plug an input device into the headphone jack. The noise is pretty regular - every 30 secs or so - and it is noticeable with the volume turned up. It even shows up in the VU meter in each of the audio recording apps I have so it's loud enough to be annoying. I've tested with multiple input devices: irig mic, ampkit link, iPhone earbuds w/ built-in mic. At first I though it was the irig mic so I returned to the store and tested 3 others - same issue - so not likely an issue with the mic. Tested in GarageBand, vocalive, irig recorder - I hear the click whether monitoring or recording - with no extra audio processing or effects so I know it's not a processing power issue. After all these tests I started suspecting my iPad2 so I tried it on our work ipad2 (also a 3g model) - same click noise. I asked my brother to test separately with his irig mic first, then with a pair of iPhone earbuds (w/mic input) - no pop - perfectly clear on his iPad2 64gb wifi. I'm beginning to think it has something to do with the 3g circuitry but I've tested with my iPhone 4s - perfectly clear audio input. I've also put it on airplane mode and the issue persists. My question - can someone take a sec to test their iPhone earbuds w/ mic (or any other input device that plugs into the headphone jack) into an audio program where you can monitor the input, turn up the volume 80%+ and listen for clicks over a minute or two. I need to know whether I should be returning my iPad or living with imperfect audio input.