Adding a Base to Floorstanding Speakers

Metralla,sorry that I didn't respond.I have lost my previous dog and have introduced a "new" puppy into my home.A real joy/terror.
I believe that Stehno has answered your question.These different technologies/approaches deal with removing or draining vibrations away by transferring or changing them into heat,via different materials.Whether to couple or de-couple a component will depend on the solidity of the rack or flooring.IMHO,only a trial and error process will determine which will yield the greater results.
I might suggest coupling to a 4" platform ,which in turn will be decoupled from the floor.I like the effects of wood,but there are other materials that may be used.
As far as spikes go,I prefer brass {Walker,Star Sound or Mapleshade,ETC}.Your results may vary,depending on room ,gear and musical preference.
Don't start with the most expensive approach first.If you find a solution,it can always be improved upon down the line.Too much of a good thing can also ruin the listening experience.
Let the experiments begin! Regards,Tom

Uh, Sxu1, I don't see any upside to what you propose. I'm currently going through the same adjustments. Having lived w/spiked speakers since '96, it's now clear to me that, IME, spikes are the work of the devil in my system.

Suspended wood floor, old CWD oak rack on casters, tired old vibrapods, and that's it. Whim strikes, remove the spikes. Right in the face, the sound becomes instantly and *very noticeable (adjective alert) faster, livelier, and quicker. Quickly realize that the spikes dump loads of bass energy into the entire floor structure (and the rooms below), up the rack structure and into the equipment; time-delayed, of course. Resulted in a draggy, sluggish sound. It nearly brought me to tears, realizing the wasted *years* in listening to sub-par sound.

Concurently was researching alternatives to spikes, talk to a manufacturer of multi-material sandwiches for equipment and specifically for de-clawed speakers, and order a trial pair. In order to optimize contact between the speaker base - which consisted of a square ring of 1" W. MDF which held the nuts for the spikes - I had a cabinetmaker mill up a pair of 1.5" thick Hard Maple blocks w/ 1" corner radii, about 10" x 11" to compensate for the spike height, plus some. Also adds some serious mass to the speaker bottom. Removed the little toy square ring, glued and screwed the maple blocks to the speaker bottoms w/ stainless deck screws. The sandwiches arrived, resulting in an obvious clean-up from low mids through the entire top end.

Sxu1, for free and with no effort, de-claw your speakers and listen for a bit...

They say spikes have some uses; maybe. My first experience was original aluminum tip-toes under a VCR with very positive results. I think speaker spikes are a manufacturer knee-jerk reaction to perceived market desires; they "look" audiophile.

The speaks are model year '96 Alon II originals. I'm a tweak skeptic, but I'm willing to try. Don't do testimonials for mfgr's websites. The sandwiches are symposium sveltes, and they are not going back. Symposium is prohibited from lifting this post as a testimonial.

I recommend that you try the slabs. It is a very inexpensive tweak that can have a dramatic impact given the flooring that you describe. I have the same flooring. I bought two concrete paving slabs from a local landscaper/ nursery for $3.60 each. The difference has been like night and day. The bass got much tighter, clear and distinct. The mid's and highs became better defined also; no competition from the nasty floor rumble as before without the slabs. Good luck!