i guess the 'magic' is that the 120 watts sounds and feels more like 200 tube watts. and the JBL's are very efficient in a nice sounding, and IMO, efficient 2x15 cab.
here's mine:
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I played through one of those Sunn 18" cabs 2 weeks ago (house rig with a Peavey Mk VII head). Sounded really fat.
I currently own several 1x15's and a 4x12. Largest cabs I've used were the SVT 8x10, Acoustic 18 folded horn, and Kustom tuck and roll with 3 vertical 15's.