JBL 4425 Studio Monitor Audiophile Nirvana Posted on May 22, 2016 by Jim LansingMay 25, 2016 The JBL 4425 is a Constant Directivity horn loudspeaker system designed by Greg Timbers. It’s based of the larger 4430 and 4435 systems that were designed by David Smith. All of these systems utilize Don Keele’s famous 2344 or 2342 …