Ok, so I've done some RMAA testing on the X5 to check on the "line out" issue from the previous thread: http://www6.head-fi.org/forums/showthread.php?t=132688 The test result is here: http://mkeroppi.com/iaudio/Comparison.htm These tests are done by recording thru a Behringer mixer (which...

2. Accuracy - diffused field equalization First of all, NI has a very good illustration/explanation of the different sound field regions (http://zone.ni.com/devzone/nidzgloss...4?OpenDocument); it is probably required knowledge for the discussion below. I will from this point on refers to the...

The ER4 mystery Introduction: First of all, there's no mystery about the sound of the Etymotic ER4 (I have the ER-4B); it's easily the most detailed phones I've heard, and in that sense the most precise. The in-ear operation and the built with great care make these earphones very...