IEM's with flat (flattest) Frequency Response? - Help me Choose!

[spc100]

Hello There,

I am looking at purchasing a pair of IEM's to use when travelling, especially flying.

I prefer to have headphones with a flat frequency response, so I hear as close to possible, the audio the way it was recorded.

What IEM has the flattest frequency response curve? or failing that, which ones are fairly flat?

Help me decide which ones to get.

At the moment, I'm favouring the Phonak Audeo PFE 111/112, seem to be described as fairly flat?

Thanks,

Sean.

 

[bcpk]

Etymotic ER-4P.

 

[MrGreen]

ER4P.
RE0 <- sort of
(Apparently) JH13

Also, you should probably have this moved to the portables forum

 

[bcpk]

http://www.head-fi.org/forums/f103/i...sponse-398925/

 

[Bullseye]

ER4 by Etymotic and Phonak PFE have very flat responses.