Does anyone have any experience using noise isolating earbuds (i.e. Shure SE500s, etc.) with the iPhone - if so do you hear any static/crackling noise even in airplane mode, with no sound and display switched off? I've never noticed this on my iPhone with the stock Apple earbuds until my Shure MPA adapter arrived and I plugged in my SE500s - with the ear foam buds these cut out pretty much all background noise and I was disappointed to hear some static from the headphone jack. I switched to airplane mode, and even with the display off, and no music playing I can hear this static unless a) I mute the volume or b) wait until the audio switches off. It's very similar to the problems that many (including me) have with the Macbook Pro headphone jack (minus the R2D2 beeps). I was wondering if anyone else had a similar experience? I tried the Apple earbuds again and if I cover my ears and am in a very quiet environment I can just about hear the same noise - it's just much more noticeable with noise isolating headphones. BTW - I've tested the SE500s on a 3G Nano and there's no static. As an aside I was quite disappointed with the Shure headphones on the iPhone - although great for music (minus above issue), they cut out too much sound when using the phone with the MPA microphone - I didn't appreciate how distracting it is when you can't hear yourself speak!! I find the Apple earbuds much better for phone calls. Maybe this will be helpful to anyone considering the Shure MPA for use with noise isolating headphones.