^^^ After going through the JBL 4560 phase, which came after the rear horn loaded era - I ran the Don Keele "W" horns with JBL E-155's in them and the compliment Don Keele front horn loaded mid bass cabinets with E-120's and 2202's in them.
They worked and squeezed lots of performance from the drivers of that era - a pair of them on each side with a pair of 2" 90x40 radials and 4 2205's would do brain damage in a 1000 seat room. Today, JBL 2269H's in single 18" reflex cabinets and 8 per side - way easier to wrangle and scaleable.
The "B" system back then was a pair of dual-12" cabinets vertical orientation with 2 x 2202 ring's and a 2390 horn/lens atop Atlas tripods and two of the DK "W" horns stacked on one side. A pole mount setup for smaller jobs like dance music and fashion shows works great. I have pole mount stuff today as well and receiver flanges in all the monitors as well as dedicated 12" pole mount cabinets.
For smaller jobs, pole mount is my preference - even with delay fills.