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Karlw, Do you think you could name some other bass-heavy IEMs you've tried? One person's idea of not enough/sufficient/too much bass could be completely different from that of another person, so it might be helpful to know where you're coming from.
Also, you said that you haven't tried messing with the ambient tuning port, but could you check how much of a difference it makes? I sometimes find IEMs to be a little fatiguing due to how closed-in they sound and the ambient tuning port sounds like it might be solution to that problem for me.
Actually, I don't really think these are bass-heavy, only that the bass is incredible and opening the port, for me, makes them bass heavy. Probably my favorite IEMs before these were my Sennheiser IE8 which I used for a couple of years until I, um, left them on an airplane (shame). I felt that they were a touch bass light, actually, but with the adjustable low-end, I was able to get them quite good. They did have a slightly hyped HF in my opinion. These (the AS1b) are quite neutral, with perhaps the very slightest richness in the mids. This is preferable, to me, than having a "scooped" sound that many hi-fi products tend to exhibit. The mids are where 80% of everything happens, and for critical listening, mids are really key. The articulation of these IEMs, the definition, the soundstage, etc. are remarkable. And the bass is very tight and clean, never woofy or mushy. Drive them with a good amp, and the bass is even better.
For me, the highs are just right - they are probably flat and thus sound detailed without zing. I never want for any additional detail - it is all there. But some may prefer a more tipped-up response because certainly a lot of products have that kind of response: an artificial level of detail that masks the actual lack of definition. Not with the AS1b. But let me say that I have sometimes been accused of liking speakers & headphones with a "rolled off top". I believe, however, that I like a flat top, but most products are hyped in the HF and people are used to that sound.
I'll have to give the ambient ports a try and report back.