Re: who does the impressions, this is sadly what I suspected to be the case. Custom IEM seem to have two London branches though which is great. I may try and arrange a demo session (perhaps getting impressions done while I’m there) as I’m back home for a couple of days this week. Happy days!
As for driver count affecting the physical size of the IEM, this is good news. To be fair, I have fairly large ears so I doubt it would be as much of a problem for me as it may be for others anyway. Though I’m guessing that my ear being large in a general sense doesn’t necessarily mean my concha will be large!
18 drivers?! Dare I ask the use case for such a powerhouse of an IEM?