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One thing I don't understand is why do ciem companys cut down the impressions whilst making the iems?
Oh and in other hilarious news my mi3s have developed channel imbalance with virtually no sound on the left. I'm close to giving up. Been in touch with Minerva (who, it has to be said have been helplful throughout) and have to make decision on either refund or replace. Waiting on some info tomorrow before making the choice.
Anyone else have this much hassle with custom?s ( reshells with fisher didn't work out and now this!).
Cut down? You mean like, why they're not sent back to you?
There is no really good reason for that - while the impression will likely be slightly damaged by the molding process, it should be quite usable. Definitely not damaged at all if they happen to use 3D scanning and UV material. (e.g. UE/Logitech, UM?)
Some companies shorten the ear canal end for no real good reason - usually this makes for less returns, but worse and more fiddly seal at times.
Usually large channel imbalance is one of two things: loss of seal in the ear or failing driver. The latter should not happen at all, so it's likely the seal was borderline in the first place and is now lost completely. In case of Minervas, there is another possibility: clogged foam filter.
Are you making the impressions yourself or at some audiologist?
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Whoever is recommending Rooth LS8 to me - no, LS8 has the exactly wrong FR for my ears, more so than DBA-02's TWFK.
This 5 kHz bump ("aggressive") causes soundstage to become flat and collapse to the center. I had enough of that with GR07 and DBA-02 (actually Brainwavz B2) - and those have far less of it than what LS8 graph shows.
In fact, if you inverted LS8 frequency response, you'd get far closer to what I want. (except the midrange)
So, this is the list: bass with some subbass bump is preferable, but I'm ok with flat; 5 kHz cut; ~8 kHz boost; lots of air.
How does NT-6/NT-6 pro compare in the treble? How much less in 5 kHz, how much more in 8 kHz?
Why the darn companies do not make reasonable graphs? The one thing about CIEMs is that personal variation should be much reduced, making measurements even more useful, avoiding the issue with ear couplers not being accurate in the highest end of the spectrum since it's custom fill.