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I don't disagree that ER4P has a little Grado taste to it, though my view on what represent the Etymotic sound is more on ER4S. The two things I consider RE0 does better than most IEM are, 1) Detail. For all the IEM I have, only ER4S is more revealing. 2) Extension. RE0 is the only IEM that can do 17kHz~17.5kHz in a meaningful way. Even ER4S starts to roll off at around 16kHz. Most other IEM I have heard that can do 16.5kHz all have fairly unbearable sibilant.
Also something for the OP, if you are still using your RE0, it might worth the effort to get some Comply TX400 (with the build in filter) for it. TX400 really goes well with RE0 by adding just a little warm to the lower end IMO.
The etymotics sounds very different from the RE0; both are treble heavy but the etymotics are much more aggressive with Grado-like dynamics and much stronger mids. And my ER4p certainly has significantly more bass than my RE0 (which I seldom use). I think the RE0 is a good contender for 'best iems for under $100' but there's no shortages of ~$200 earphones that's superior to the RE0 in most ways.
I don't disagree that ER4P has a little Grado taste to it, though my view on what represent the Etymotic sound is more on ER4S. The two things I consider RE0 does better than most IEM are, 1) Detail. For all the IEM I have, only ER4S is more revealing. 2) Extension. RE0 is the only IEM that can do 17kHz~17.5kHz in a meaningful way. Even ER4S starts to roll off at around 16kHz. Most other IEM I have heard that can do 16.5kHz all have fairly unbearable sibilant.
Also something for the OP, if you are still using your RE0, it might worth the effort to get some Comply TX400 (with the build in filter) for it. TX400 really goes well with RE0 by adding just a little warm to the lower end IMO.