No, the spike can't be eliminated, I've tried so many various tips.
The best I was able to do is reducing it about 3dB then moving it 500 Hz down from 7 kHz (super annoying) to 6.5kHz (just annoying).
I have small ear canals, which complicates matters.
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The "analytical" comment can actually any of 4 things:
1) IEM is bass thin
2) IEM has no natural bass boost
3) IEM has fast or no decay
4) IEM has fast attack
5) IEM is very well extended up
In case of RE272, it's mostly 2, 4 and 5. It doesn't have the customary natural 6dB/oct bass boost. Has a tiny amount of subbass rolloff, like 3 dB below 30 Hz, best result out there I think.
Real easy to equalize it.
Hell, even unequalized RE272 is more musical and "characterful" than GR07.
While GR07 sounds like.. hmm, like electric guitar, rough and a bit boxy; RE272 sounds like celesta or plates (percussion), a tinge electric.
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Here's an analytic IEM's (in sense of 1 through 4, which is worse than RE272) measurement:
http://en.goldenears.net/index.php?mid=GR_Earphones&page=7&document_srl=1512
RE272 has much flatter and better extended bass.
And here's a completely non-analytic IEM:
http://en.goldenears.net/index.php?mid=GR_Earphones&page=7&document_srl=1678
While here you get a superb balanced measurement, but not too extended upwards, thus not usually considered analytic. (Ortofon e-Q7):
http://en.goldenears.net/index.php?mid=GR_Earphones&page=5&document_srl=2876
Oh, and here's something that sounds a bit similar to GR07; Grado GR10: (Except I'd say that GR07 has rolled off subbass and higher 7k peak)
http://en.goldenears.net/index.php?mid=GR_Earphones&page=2&listStyle=webzine&document_srl=6332