I recognized the noise was coming from the E11 and returned it... Think I'm gonna try the JDS Labs c421next...  I wonder if quality control is becoming an issue at Fiio or if this sort of thing just happens once or twice every so often...

I did some more experimenting trying to reproduce the buzzing / crackling noises I am hearing while using the L9 and E11.  I now suspect the noises are coming from the iPhone 4.  In listening at very low volumes I continued to notice the noises intermittently, however with the volume turned down...

Hi everybody - I've learned an awful lot from reading all the posts here on Head-Fi, but I believe I'm having a problem with my E11 that may not have arisen/been addressed yet...   Recently got the ATH-M50s after reading all of the positive reviews written about them here - I think these...