Better sound

"Just be aware that anything you put under the speakers that is taller than the existing spikes is going to alter the sound by moving your ears out of the vertical sweet spot." Interesting! How do you know the OP's ears are IN the, "vertical sweet spot?" How high is his listening seat? How tall is he? A speaker that was so beamy, in the vertical plane, that it could not remain accurate if raised or lowered by an inch or two, would be pointless. How many people do you know, that are exactly the same height? Just curious! Just saying.....

As much as I like Auralex products; anything you place under your main/full range speaker, that allows the cabinet to move, will blur imaging and smear transient detail. Spikes are best(solidly anchoring cabinet/draining vibrations), generally adjustable, and can be placed on metal plates, to protect hardwoods(http://images.search.yahoo.com/search/images?_adv_prop=image&fr=my-myy&va=speaker+spikes+and+feet). Some enjoy cabinet colorations/vibrations and, "softer/more relaxed sound" , just as some enjoy the colorations of microphonic tubes. That's a matter of personal preference, and as some would say, "YMMV."

Mr T- Stillpoints dealers are supposed to have demo pieces avaiable, for your audition. The Stillpoints are excellent for electronics and isolation from extraneous vibrations. They would not, however, couple a speaker cabinet to the floor, help drain it's vibrations, or prevent movement(in any plane). It's been my experience; these are paramount to accurate reproduction, whether speakers are box or planars. If you can find a Stillpoints dealer, that will allow a home demo; you have nothing to lose, by trying them. Happy listening!

Hi Shakey- If he were thinking of raising them several inches, I'd have to agree(beyond already agreeing with your recommendation to experiment).

Hi Larry- Regarding, "better": Like I said in my first post; it's a matter of preference(completely subjective) and YMMV. By all means: experiment! If I had exposed hardwood; it would just have to suffer(a matter of priorities)! Metal under spikes is by no means optimum. BTW: Spikes are supposed to(theoretically) act as a sort of mechanical diode, allowing vibes to travel from their wider part, to their points(one direction), then into whatever they are atop("Mechanical Grounding"). Some substrates work better at that, than others(again: experimentation required). A different approach to vibration handling than the, "Energy Conservation" method of yours or the Stillpoints(converting motion into heat). Auralex is basically foam rubber, and would allow much more motion of the cabinet and drivers relative to one another(action/reaction) and to the listening position. It takes very little of that, to have a deleterious(to me, anyway) effect.