[TheoS53]

I recently made a testing rig to measure IEMs, and decided to do a few tests of the E12 just for fun. Now, I'm no expert with these things, but the results seem pretty darn good to me. Perhaps someone else can confirm or enlighten me.
 
Key:
 Base line
 
 Low Gain Bass boost
 
 Low Gain
 
 High Gain Bass boost
 
 High Gain
 
 

 

 

 

 

*Distortion figures are at 1KHz

 

[ClieOS]

You can compare some of the result to the official FiiO measurement. If anything, FiiO is known to publish fairly accurate data.