[guani360]

I'm about to make a purchase and I would love to know which iem is better. Can you guys please chime in to help me decide?

Thanks

 

[ezzo]

I wouldn't recommend the Westone W40 for the price they cost. They have a mid-bass bump and upper-mids dip, treble extension isn't great either.

 

[serman005]

I'm about to make a purchase and I would love to know which iem is better. Can you guys please chime in to help me decide?

Thanks

You might check out the Shure SE535 and especially the Campfire Nova--neutral, transparent, exquisitely detailed. Incredibly well made. Worth looking into, for sure.
 
I haven't heard the Audio Technica, so I can't comment. I like the W40, but it does have some of the frequency response anomalies mentioned, IMO.

 

[guani360]

Ok thanks guys.... I've pulled the trigger on the ATH-E70... Now i'm looking for a portable amp. What is the best portable amp to power these bad boyz?

 

[ezzo]

The benefits of a portable amp for an IEM is almost negligible. The benefits are usually from the low (<1ohm) output impedance. Just get a DAP with a dedicated amp section. Check out NwAudioGuy's blog if you want to know more about amplifiers and other audio related science.