Thank you for your advices regarding a seal. It was really the reason why I heard them to sound very thin when I listened to them first time.
I listened them again today and foam medium tips are the only ones which keeps them in my ear if I don’t move at all.
I don’t know what it is and why I couldn’t get them to sit firmly in my ear even if I walk, especially as Senn TWS 3 sits perfect even if I run, but anyway…
It is been said for thousand times for sure, but yes, I can agree they are a little on a bass shy side, but for me that wouldn’t be an issue if they have more developed sound and more layers(?) in the middle.
They are also kinda little bit harsh with nervous and prominent edge especially to the guitar strings which makes them a little bit tiring to listen to.
I appreciate well known Sennheiser neutrality, but for my ears it is a little bit too much which makes them a bit monochromatic and I would expect more substance and depth as that very prominent edge to the sound draw attention too much.
I am a little lost when you said you listened to them again with medium foams but they were still essentially falling out of your ears. That doesn’t sound like much of a way to judge the sound.
If they were loose with medium would you not go to the large size ? With the loose fit nearly falling out of your ears they are highly likely to sound bass shy and thin because you would likely not have a good seal.
The IE600 are not bass shy, that hasn’t been said a thousand times before at all, except by comparison to something that is very bass accentuated.
For me foam tips, even those that fit well, don’t do the IE600 justice. Silicone work miles better, genuinely like a different IEM.
If you didn’t have a good seal, and it certainly sounds like you didn’t, the thin bass will accentuate the already sharp treble and likely make them sound like you described.
The IE600 are a long way from neutral as is associated with say the HD600 if that is what you mean by Sennheiser neutral. They are nowhere near how the HD600 sound, I have them also. They are an unashamed V tune with emphasis on bass and treble.
You may simply not get on well with the IE600 in terms of fit, seal and therefore good sound. They are a much shallower fit to what I prefer but I blind bought them so I had to figure out how to get a good seal in the outer part of my ear canal where they sit. I ended up with the XL size Penon Liqueur which seal exceptionally well and sound great. Initially it was a real nuisance to try and find a set up that sealed well and frankly if I could have tried before I bought them I may not have ended up with them. I am however happy to have them now that I have the fit sorted out.
They may simply not be a good pick for you despite the praise they generally get.