Pros: Smooth overall sound, large soundstage
Cons: Isolation good not great
I own variety of more expensive IEM however these have to be my favorite. This is mostly due to the huge sound stage which sounds like a full size over the ear headphone.
The highs are crisp clean with good detail and without sibilance.
The mids although slightly recessed still have good presence. The vocals on a good recording will float just above the instruments.
The base is rich and full and will go very low without a lot of bloating. The base may not be big enough to satisfy a base head, however and analytical listen would consider it big. I listen to rock which I would consider the amount just right.
Comparing these to the HA-FXT90 I would say they are pretty close in signature but not the same.
The CKM500 having the edge as they have slightly less treble extension but not a lot. Its just enough to keep it from being strident as the FX90 can sometimes be on certain recordings.