Best treatment for speaker feet????

Stillpoints SS Ultra's, anyone have an opinion?

Bmckenney -- think about this: your speakers/drivers (unless you're talking about down-firing subwoofers) vibrate horizontally. Your floor vibrates vertically. So it's not your speakers that are exciting the floor. It's the air pressure (SPL) of the waves in the room (which are omnidirectional) that are exciting the floor, and there's not much you can do about that, other than stiffen the floor from below, or by adding another layer of subfloor.

Decouplers on speakers are always inappropriate anyway, because the object is to restrain the speaker enclosure from any kind of movment whatsoever. And anything resilient between the speaker and the floor (or slab) that allows the speaker to rock forward/backward in equal-but-opposite reaction to the movment of the driver(s) will degrade performance: bass slam and hi-freq. transient response. So the notion of decoupling a speaker from the floor is completely counterproductive in terms of getting the best performance, and any speaker manufacturer will tell you that! Some people might like the way their speakers sound when they decouple them (God knows why!?) but they are definitely NOT operating the way their designer intended,

So get your speakers back on their spikes, but pay some attention to positioning them (relative to the floor joists) as I outlined above.
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Well, I use both coupling and decoupling devices together, Polycrystal spikes with Boston Audio tuneblocks for spiked components, on a wooden floor in my appartment. It is better in every respect than just spikes, especially there is less distortion in all frequences and everythings is tigher and sharper. But my speakers are quite loose and do perhaps need more control than average.

Nsgarch: Interesting opinion. I respectfully disagree about the spikes. The flooring makes sense though.

I totally disagree with Nsgarch's comment that decoupling is always inappropriate. With carpeting, coupling makes sense because the carpet pad drowns out the resonance. On a wood floor with floor standers, decoupling is the only way I've ever had success. I actually went two years with my speakers on Aurelex Grammas which are made for guitar amps that sit on raised stages. I would spike your speakers and be done with it. I use a caliper to get three of the 4 spikes set even with each other and tight and the fourth one close to the other three(always leave the front right side as the loose one). Once in place, you set the fourth spike.