Hi,
I've been running JBL 4435 Monitors in my audio rig since 1983. IMHO: They are eargasmic! The Array1400's are nice speakers, design by Greg Timbers. FWIW; All horns are waveguides, not all waveguides are horns. Good read on horns by Don Keele, he also designed the horn in the 4435/30 monitors. See below.
https://www.xlrtechs.com/dbkeele.com/papers.htm
http://www.audioheritage.org/vbulletin/showthread.php?10643-1400-Array
Mike