How about sound wise?
No clue, I only tried cheap iems. BUT please do note that iems sounds just as good or bad as headphones. Sonically both technology offer high resulition play back. It's just a matter of fit for me, iems do not fit so I NEVER use them
What is EM??
My mom's friend actually gave us two pairs of M4U2, we were surprised by their active noise cancelation (and that someone was financially able two give two of this away) right off the bet. We actually spent a good 30 minutes listening to the headphones while shouting to each other; amazed by the noise cancelation. Only after awhile did I realize that the $40 earphone I was using at that time was out of M4U2's league. I accidentally washed that earphone a month ago and now looking for an IEM that is on par or better than the PSB M4U2. I am considering the Westone 4R and ER4-PT. What do you guys think???
I have the ER-4PT's and they're wonderful. $230 at many places, which is another factor that made my decision. The Westones retail for almost $100 more than that and the Shures (SE535) are even more expensive, still. Plus, both the Westones and Shures - while they are balanced armature designs - use multiple armatures with crossover networks. The Ety's are more "pure" in that many people can hear the smearing effects of crossover networks. I'm not saying I can hear that, but I still like the Ety's.
P.S. IEMS will still sound different than headphones - just as headphones sound different than speakers. I'm not saying one is better or worse than the other - just different.
I have just seen your profile and it shows that you have had Westone 4 previously. How does it compare to ER4P?
Is multiple armature with crossover networks bad? or is it good? I have never heard that this could affect performance.
It's probably in the category of personal opinion. Yet, crossovers always cause an effect - any filtering device in an electronic circuit does. Whether that's audible and whether the added capability of having multiple armatures dedicated to specific frequency bands outweighs that disadvantage is probably also in the category of personal opinion. The argument has been going on for decades with speakers. I don't expect that the argument with IEM's is any different. You just have to decide which side you're on.
The W4 is a more beefy sound, but not really bassy. The W4 is more comfortable and a little more 'wooly' sounding compared to the ER4P. What I mean by that is in terms of detail retrieval (especially upper mids/treble), the ER4P is a little better. It sounds perfectly clear. The W4 details are just about as there, but not as easy to hear compared to the ER4P. The W4 is quite balanced, but has a little more bass compared to the ER4P. Then again, most earphones have more bass compared to ER4P because most earphones have boosted bass frequencies.
Basically there is more mid bass leading to a fuller/thicker sound compared to the ER4P.
Well, the W4R is a great all arounder. Westone and Etymotic have about equivalent customer service (great, generally). The ER4P has better clarity, isolation, and maybe better durability. The W4R on the other hand has a removable cable, which is always a plus. I'd take the ER4P if you ride on airplanes a lot or love classical, but the W4R is probably better in most other areas. If you love your treble, the ER4P is superior in that area imo. Keep in mind most people wouldn't consider either phones 'fun' sounding as they are pretty close to neutral. They're both pretty flat, but the ER4P is more flat than the W4R.