Amazing reply
Also about insertion level is valuable. I immediately noticed you miss out on impact and detail when too shallow. No good.
It must have been said a dozen times in here but I'm interested in what you think about differences between black E vs white? So far in stock form, from a Hiby R6 Pro, the E5000 is stuffy sounding and I doubt it can be turned around satisfactorily. Someone here pointed to Final's recommendation of 150-200 hours burn-in which might play a role? I've paid this phenomenon very little mind for full-size headphones. Then again, bronze ears for sure.
To pursuit other IEM or to pursuit not is the question.
Does your friend have any favourite(s)?
The white ones take "some" (read "a little") bass out. This is due to their silicon umbrella being softer than the black/colored versions.
On your "stuffy" sensation.
Firstly, sadly I can't say about burn-in as I got my E5K 2nd hand & burnt.
If by "stuffy" you mean "congested" as in
dramatically failing at imaging and resolution - then this is really odd. E5000 is not that, unless seriously underamped which is impossible on an R6
If by "stuffy" you instead mean that the overall sound "sounds too full", too "meaty", "too dark" then I'm afraid there's little to do: that's E5000.
Surely, R6 is a warmish source. But pairing it with a brighter one will not change it night/day.
E5000 has a textured musical bass and especially sub-bass, with little to no bleeding at the sound origin level,
but what I call "psychological" bleeding
is there: all that bass
does bias my overall sensation and impacts on my "acceptance" of the other frequencies, even if they are indeed there with their own apriori independent personalities.
It's a shadowed room. In french the exact word would be
"sombre" I think
. Soundstage is big, but the "darkness" sensation is such that your "skin reaction" is rather that of intimacy. Only after you adapt you perceive that dark does not imply narrow. Etc.
If you
do not like this, E5000 is not for you.