Hello Cygnus,
The JBL systems are great speakers but not designed for a home based situation. The depth on the horns alone are typically a few feet if not more depnding on the size of the system.
The 4000 series (4675) is the most commonly used cinema speaker JBL produces along with 8330, 8340 surround speakers. You will typically only see those 3 way systems used in large showcase houses.
Klipsch, EV, Eastern Acoustics Works, Smart, QSC, also make great systems as well that get used quite often in cinemas. Even Boston Acoustics dabbled in the cinema market along time ago.
All newer Regal Cinema sights use Klipsch speakers exclusively. Most of the entire Edwards theatre chain uses JBL. AMC uses a mixture of alot of stuff but lately they seem to be sticking with JBL.
You can pick these up from most any cinema supply company.(Special Order) Its not something you walk in and listen to. You could probably do a dealer search on their sight.
Cheers