I had JBL 4319 before and I got me a brand new JBL 4429 instead.
Wow, I must say, great sounding speakers. Horn sound is, well, horn sound just sounds nice. I just connected it about two hours ago. Sounds allready good. Playing at same volume setting as with the 4319, namly at 50% at the volume on my McIntosh C48 and the amp is the same MC252.
Break-in don't know what this mean
Fantastic speakers and job well done JBL.