Just weighing in with my impressions as well, seems like there aren't many reviewers with this model at the moment!
Can vouch for Crin's graph, I measured this earphone about a dozen times and basically thought I'd bodged my last repair on my measurement rig because what I recorded just didn't match up with my subjective impressions. Nevertheless, I received a graph like this every time.
In subjective listening, this is a weird one for sure, but not necessarily in a bad way, and I do have faith in Shozy considering that their previous IEM releases have been very well-considered. The Black Hole isn't perfectly linear relative to any reference curve, but in listening does sound substantially more balanced than measurement would suggest. In particular, the treble doesn't come across nearly as forward as suggested nor does the bass sound as lean as measured to me.
I can only attribute this to the open design, it truly is a unique experience I haven't received from any other IEM - it's about as open as an earbud but provides a seal so you do get a nice, extended bass. It has a wide-open stage and good resolving power. The signature is not bass-heavy, but far from anemic. The bass has a full voicing that means it doesn't get lost despite being a bit laid-back, and the signature has a moderate upper-mid focused to my ears which means clear, slightly forward vocals but also not the warmest, smoothest or fullest sound for those valuing these qualities.
I think the main appeal is surely the ability to maintain spatial awareness and a huge, almost headphone-like soundstage without sacrificing bass extension or resolution as earbuds commonly do. What's less debatable is the gorgeous and unique aesthetic design and metalwork on Shozy's behalf. If anyone has questions, happy to answer and I will be working on a full review as well!
In the interim, enjoy the eye candy
