I first tried Jazz Flats, loved them! They were great, but I like having a brighter option. Even though JF’s are considered bright, they’re not rounds. I did a lot of reading and a lot if asking and found that there was not much talk about Jazz Rounds at the time. From the little that there was, I had to really hope they would sound good. To my ear, they have similar low mid presence like the JF’s, but have a bit more snap. Exactly what I wanted.