A Friend of mine last year put together a 16 channel speaker assembly,
in a 1 1/2 cubic foot area.
He purchased 16, 3" full range speakers,
and made 16, 12" high, (Approx) by about 3 inches square enclosures,
which he bound together in a "Cube", facing up
placed behind the console, and sitting on top of his Sub.
The organ is a "three manual Classic Organ Works Instrument",
and sounds quite realistic, in the hands of it's AGO member owner's, "Living Room, not Hall" !
It is hard to believe that 16, small Speakers,
mounted on top of small sealed rectangular tubes, "can produce such a Big Sound".
(Does, the term "Sweet Sixteen", sound familiar to anyone here, it sure does to me ) !
Make sure that you "provide
Airtight Solid Compartments", for each of your speakers !
Mel