It would be nice with some advice because I am totally stuck.
Have been testing some IEM and TWS and all of them gives me problems on some tracks - most of the tracks are with piano. It is like the piano “screams” (slight sibilance is maybe a better description, not sure). Not very pleasant.
If I use my headphones - Austrian Audio The Composer (open back headphone) I don’t have any problems.
Thanks for any suggestions 
Torben
I don’t mean to provide you with a negative response, but this maybe an issue of your hearing not suiting iem’s/earbuds. There is something in the ear architecture that prefers greater distance between the eardrum and the source of sound that can be effected by micro millimetres; maybe this something that effects you?
You may want to try out some different ear tips as well Torben as you may get some minor differences that can make big differences in those small ear canals.
YMMV but I find that Foam Ear Tips with a large aperture tend to increase bass slightly and reduce highs slightly when compared to my SpinFit Silicons with narrow aperture.
Definitely this, as an IEM user I need to pick ear tips carefully otherwise I get awful unbalanced sound. Another option if using standard tips and not 3rd party ones, is PEQ, use one of the Harman curve settings on AutoEQ or by Oratory1990 (my preferred) as a starting point.
Could you name a few examples which gave you that result?
A lot of current IEM seem to be rather on the more brilliant side of tonal balance (in many cases combined with a beefy bass so they do not appear to be thin). It might be a good idea to experiment with a parametric EQ to find out which particular frequency band is likely to cause you problems. As a start I recommend to tune a parametric filter 5.5k, Q=2, +3dB and check if this is reproducing the annoying sound on your over-ears.
If it is a problem of tonal balance, you might want to choose one of the ´warmer´ models on the market.
Regarding eartips according to my experience they mostly affect the bass, i.e. the wrong choice might lead to a leaking earbud thereby loosing bass. If the bass is full-bodied, I would rule out the problem of wrong eartips.
@Glimmer @Arindal @Fergus_B @Grasshopper - Thanks for all your suggestions
@Glimmer That could be - I don’t know. The strange thing it happens only with some Jazz tracks with piano.
@Fergus_B Ear tips can make a nice SQ improvement. I have tried different ear tips but not with a big improvement to the problem.
@Arindal - Currently:
Bellos Audio X4 CIEM
Astell & Kern - PATHFINDER
Torben
Never tried the Bellos, but Pathfinder I found to be rather on the brilliance-rich tonality.
It is still not clear to me if tonal balance is the main root of the problem you encountered, or something related to resonance inside your ear canal. You might want to do some experiments with DSP-based parametric filters (easy to handle in roon) and check if the frequency bands arounds 5.5k or 2.5k change the perception.
In any case, there are some models offering a more natural or even warm tonal balance as well as the possibility to not have the ear canal getting this feeling of total isolation. I found Beyerdynamic Xelento 2, Final A-5000 and some discontinued Sennheiser (IE80) and Bose (Soundtrue) models to be most comfortable and least annoying.
Not sure if it has to do with BA drivers as some of these do not cause me any annoyance while some dynamic drivers do.
Maybee it is not a fair comparison, but I have bin testing Sennheiser MOMENTUM True Wireless 4 for some days now (AptX Adaptive) and had no problems.
Any suggestions for some DSP settings:
Torben
That’s a pretty well-balanced pair of earbuds so I am sure you will find a model that suits your taste.
I usually start by trying to identify narrow frequency bands which are most annoying to you by emphasizing them overly on some well-balanced headphones or speakers. Example:
Then tune the frequency to 2600Hz instead and listen to the result. Afterwards 4000Hz (which is the most sensitive band for the human ear) or fine steps somewhere in that band between 2500 and 5500 Hz. Once you found the most annoying band you reverse the filter to -3.5dB or similar and make it a bit broader (Q=2.5) and try the earphones or speakers which sounded annoying. If your ears are just sensitive to a certain frequency band which the particular pair of earphones are emphasizing you stand a pretty good chance to reduce that problem.
In your case maybe continue searching for earbuds which sound natural to your ears might be a good idea. Or just take the Sennheiser Momentum TWS4, they are really good.
I would check if there are AutoEQ or Oratory1900 PEQ settings for them, the latter shares them on a Reddit page.
I prefer the Oratory1990 settings personally.
You have nothing to lose.
And here‘s the link to AutoEq for convenience.
