The physical foundation:
Electronics can somewhat improve the performance of any array. But only TRAP (TRue Array Principle) loudspeakers can approximate a single point source of sound even with large arrays. Ordinary loudspeakers can’t help interfering with each other when clustered, because their acoustic centers are widely spaced.

That is why we designed TRAP horns and enclosures to move all acoustic centers as far to the rear as possible, where they can be closely aligned. (See illustration on next page). R-H TRAP products are designed so that simple "tight-packing" of all TRAP speakers results in consistently smooth coverage.

Since all sound originates from virtually the same point in space, interference between adjacent horns is largely eliminated. Arrays of TRAP loudspeakers produce a phase aligned wavefront with uniform frequency response across the coverage area. Below the horn’s cutoff frequency, RPA signal processing reduces low frequency interference and can improve pattern control. The result is great sound at every seat.