How is turnaround?
Congrats on your new edition. (Please don't play any New Addition)
There you go - I always thought they were dynamic based on the wording of Shure literature (micro drivers) They have never been on my radar as a pair I would actually buy as there are so many different IEMs at that price point that are superior to the 315.
Yeah they can be turned into a custom, it's just a tiny hole in the metal I think, would be fine in a reshell... it's not a port per say... I've had many Shure's and they fit similar to customs... so i don't know how much more comfortable they would be as customs... although if you change out the cable, it's a bit thinner.