It's actually a fact that PLACEMENT is a highly effective tool for harnessing the nearest "acoustic boundary" and/or "corner" (as a "no extra charge" addition to any speaker system that effectively gets more "leverage" onto the air from a given set of speaker cones) rather than simply being some form of "mystical magic" that may or may not be noticeable.
A single L3s "laid flat" alters things in two ways:
Bringing both of its cones equally closer to a floor boundary, therefore (naturally) further away from the ceiling and The consequent side by side arrangement of its two drivers decreases that system's horizontal dispersion, while simultaneously increasing vertical dispersion, whereas the upright "stacking"of drivers on top of each other does the opposite, "narrowing" the system's vertical dispersion while increasing its horizontal.
For a given acoustic space, or notional "box", then, placement alone can completely alter how the bass is perceived, whereby some "rooms" will become almost irredeemably "boomy" and/or "boxy" and/or "whoomp feedback" prone with (say) a pair of incorrectly placed subs working against each other to also create "nulls" and "nodes" where hardly any bass is actually audible, ...as distinct from having the same notional pair intelligently located, or even "stacked" so as to radiate uniformly coherent bass from a single point that's directing the waveforms away from as many boundaries as possible.
Perhaps the best demonstration of this effect can be heard where no boundaries exist to either help or hinder, in which case audiences can be comprehensively amazed at the distances over which coherent, full range audio can be "thrown" from what appears to merely be a single pair of StageSource L3 mid/tops in their normal FOH positions on either side.
That sort of "magic" is readily achievable at outdoor festivals and the like by pair of L3s subs actually doing most of the "heavy lifting" from their "invisible" position, ...laid sideways, but "stacked" on top of each other, dead centre and fully under our high stage's leading edge, from where they can not only derive maximum "leverage and loading" from the ground on which they're standing, but also achieve the maximum and most evenly dispersed (staggering) "thump" as a result of radiating from that single point.
Dead easy via Line 6 Link.