For me it seems to be more to do with which IEM I have. The case might not be shielded perfectly but I think certain IEM with poor shielding act like an antenna and just add to the problem. So far my best pairings are ER4S/IM04/IE800. They sound great with no need to add an amp. M is a good source for wagnus however I dont feel the need to have it.
7/12/14 at 3:13am