Is Subwoofer Elevation a Viable Option?

So, why do we even want the bass to be "reinforced"?

If the low frequencies aren't reinforced in a uniform way, that might be of some benefit, but I very much doubt that's the case. Even if it does, why not just increase the loudness instead adding room boom?

Maybe if we have less reinforcing we can save some dollars on bass traps.

The reason to use multiple subs isn't reinforcement so much as it is to break up standing waves- that 'room boom' you mentioned, or it can manifest as a lack of bass at the listening position while there is good bass elsewhere in the room.

Furniture is always included as a way of mitigating bass frequencies and serves the same purpose as a bass trap. 

It would have to be specially designed to actually be a bass trap. Its much better at absorbing higher frequencies. Wherever you got that idea about furniture being an effective bass trap is erroneous and might be part of why this thread exists.

Because the sub is typically on the floor, along with all the furniture in the room, wouldn't low frequency waves be blocked/diffused a lot. Wouldn't the sound from a subwoofer benefit from an unencumbered dispersion of energy into the room?

@tony1954 No. At those frequencies the furniture is acoustically transparent.