I have been listening to these for a few weeks now. My go-to earphones are Etymotic Hf3s, so the ADVs are quite a departure. I also have Westone 4s, and I listen to those with the red star tips (a relatively deep insertion). If I use those same red star tips (or anything else that requires a deep insertion) with the ADVs, the bass is overwhelming.
After experimenting with lots of tips and insertion depths on the ADVs, I have found that what works best for me are the Comply Action tips (the ones sold at Radio Shack). These tips result in a very shallow insertion, and don't provide anywhere near the isolation that I get from my Etys or W4s; but with the Complys the treble emerges, and the bass (while still strong) recedes, just enough to make these earphones quite enjoyable, with surprising detail and still very satisfying bass. The ancillary advantage is that with these tips the ADVs are incredibly comfortable (since nothing is jammed into your ear canal). I actually prefer the reduced isolation in many instances. I feel safer walking around the streets of NY at least moderately aware of what's going on around me, and I can see how in an earphone intended to be used for running, skiing, etc. this makes sense. At the moment my Etys are still the earphones I grab most mornings (I save the W4s for special occasions) - but I am not at all sorry I bought the ADVs and I am using them more and more.
It would be really interesting to hear from someone from Westone on these boards who might elaborate on what they were thinking when they designed these earphones, and, particularly, the intended insertion depth and use cases.
Edited by rhsauer - 7/10/13 at 8:25am