Noise from a charger or a ground loop would not necessarily be louder when volume is increased.
If the noise broke into the amplifier stage, then turning the volume up and down would affect the noise level.
I am a new headfi'er that just got an E12 and wanted to add my first impressions and comparison to E11 on this thread, but it was too long and seemed off-topic for what is being discussed now. If you are interested, here is the link:
I've gotten a great deal of helpful information on these forums and wanted to start contributing. Any posting advice you may have for me is welcomed, and I hope someone can benefit from my input.
(Sorry if it is impolite to post a link to my thread on this similar one - I am new to forum posting and still learning the ropes. Thanks.)
Hey, it's not off topic.
Feel free to post it here!