I thought the couch and coffee table would be inconsequestial, maybe not. So, I will try the blanket on the couch and various materials around my listening position to see what difference it makes, if any. About the sound characteristics in relation to the listening position, the closest I can get to quantifying this is to run my ypao room correction software and compare the frequency sweeps in the seated and forward/raised positions. As far as a description of the differences in sound vs position it’s simply a matter of the soundstage filling in beyond that back of the speakers toward the rear wall like it should be.
Yes, simply changing my ear height in relation to the speakers has a dramatic effect but that's because these speakers have a crossover with slow slopes so the gradual transition betwwen the drivers causes abrupt changes in sound due to the change in vertical dispersion. That's complicating things, though.
I will attempt the changes and report back.
thanks for the advice