I'm in the process of purchasing a pair of TH118s (from Mr Pyle).
I often use my portable truss stage which is 24" under the platform (1 1/8" TinG plywood with carpet).
The subs will physically fit under the stage with 1 1/2" clearance.
I'm wondering if it's feasible to run an end fire configuration in that space.
Will it function as intended?
Will it transfer too much bass to the platform?
One in front and one under? Both under?
Any electronic steered system, which is based on interference (like endfire and cardioid) rely on the sound being able to fully propagate around the cabinets.
When it is restricted (by a stage deck or wall etc) the overall character changes.
How much? It depends on a number of factors that none of the models (that I am aware of) are able to deal with.
So the best advice is, try it and see what happens. But BE SURE to see what is happening in a number of different areas-behind, on stage deck, in front etc.
One place may be fine, but others may suffer-or not.
I have never actually done it, so my experience is based more on "theory" than reality in this case