Nice analysis. But generally sub manufacturers recommend corner placement for a single sub, which generally develops more deep bass at the possible cost of increased distortion. Spiking may turn the entire floor into a resonator, which may be desireable or undesireable depending on floor composition and personal taste. I prefer slight elevation on an Auralex foam plaform to minimize resonance of my sprung wood floor.
standing waves
i notice when i stand from my listening position, the bass is fuller, louder, better than when seated. I rearranged some furniture and it helped a bit. Ive got an area rug in front of speakers for first reflection..i just picked up from Accoustical solutions a pr of basstraps...not impressed with these...im pleased with my current speaker location/placement (after a long time of experimneting) not sure what my other choices are. I have a Rel Storm 3 sub..should i put this on a piece of granite? on a stand? thx