Summary: Damn - I wish I had bought these IEMs years ago. This is just an unbelievable improvement in comparison with my UE 10 - which were breathtaking in 1996. The JH16 just explode with attack and bass slam - but are just terrific across the entire sound spectrum.
Pros: Lots of detail with a wonderful transparent soundstage - with great slam on the bass.
Summary: Perfect fit first try, using a closed mouth ear impression. Funny thing is that this thing hits my ear bones. For some reason, my ear canal is not soft tissue, it's hard bone. I can't even wiggle it, it stays in place, and I may even break it with my ear canal if i press hard against it.
Pros: Very accurate and revealing, insane bass ability
Cons: will amplify any bad sources to the point of insanity
Summary: Nice full range frequency response IEM's, the best I have heard. I play out DJing and doing live performances, and also do lots of field recording. They are much smaller in size in comparison to my UE-18's (Ultimate Ears).
Pros: tight controlled bass response, smaller flaceplate over the UE IEMs
Cons: the fit wasn't quite right on both of my IEM, had to send back