Coupling or Decoupling speakers?

I have always coupled my loudspeakers to the listening room floor with cones/spikes and thought that is how it should be.  I recently stumbled on a discussion of the issue.  After reading a good bit I decided to decouple my Vandersteen Treo CT speakers using Herbie's Audio Lab Titanium Cone/Spike Decoupling Gliders.  So now, instead of having my speakers spiked into the concrete slab under my carpeted listening room, the cones and spike fit into the decoupling gliders and ride on the carpet.

I was assuming I would hear a difference with music containing bass, especially as my 2wq subwoofers sit right behind each speaker.  The unexpected outcome is that even music with virtually no bass sounds smoother/cleaner and more "real".  The frequency balance does not seem to have been altered, everything, and I mean everything I play is smoother and cleaner.  The soundspace is more open and the decay into the recesses is just a bit l o n g e r.

Please share your experience/ideas/opinions about what is happening with decoupling versus coupling speakers.

Everything changes the sound envelope in audio.  I have Vandersteen 5A's on a Travertine floor.  I will continue with the spikes on "protectors".  Carpets are different. Over the years I've tried so many resonance control devices....most of them remain in my "junk" drawer...but how great it is when you find the right gizmo that actually improves the system.
Decoupling...we have to be careful how we use this word. I like to use the words vibration draining. I have my large floorstanders on Starsound SP101 platforms, and I experience the same thing. The speakers disappear much more, music is smoother and clearer, bass more controlled. If I understand the way it works correctly, the vibrational energy of the speaker enclosure is being drained via the cones into the platform which is then dissipating it. I have heard of so many audio gimmicks over the years, but this is the real thing and I'll never give it up. Sounds like your Herbies gliders may be doing the same thing.   
This is really surprising to me, as my experiments with added weight seemed to indicate speakers moved back and forth somewhat in reaction to woofer movement.

If I was rich I'd try them. :)

I bought Townshend Audio speaker bars to put under my Analysis Epsilon and the result is stunning especially in the bass but also in other areas. It was just for a try but I kept them and very happy. My opinion is not based on argument or theory w
that is what I heard.
have a look at the videos on their website.

@barbapapa I just took a look at the Townshend Seismic Bars.  They are very impressive!  From what I can tell from the site, they look really robust and present with a very high end appearance.  They are also expensive.  That's not a slam.  I can see why based on the elegance of the design and the machining that goes into their construction.  

By contrast the Herbie's Titanium Cone/Spike Decoupling Gliders are rather "pedestrian". I must say, however, that everything I listen to is cleaner, up and down the frequency range.  I originally anticipated hearing only improvements with music containing a significant bass component, but it is cleaner and more open on everything.  Listening to Schubert's Trout Quintet has never been more satisfying.  Pink Floyd's Division Bell, McCartney's remastered "Ram", Pink Martini, AKUS. It doesn't matter what type of music.  It's just better. 

I would encourage anyone with spiked speakers to try decoupling.  I haven't detected a downside yet.  If anyone has, please share your experience.  I am still surprised by the magnitude of the improvement.  Disappointed I didn't come to this understanding sooner.
The Townshend Seismic isolators are also available without the bars, just the Pods themselves. If they work with your speaker cabinets, three of them are much cheaper than are the bars. 
 I have Sistrum stands under my speakers and mono blocks which are between the speakers to excellent effect. 
My DIY rack is 3 3/4" Butcher Block with brass threaded rod through to the floor using acorn nuts top and bottom.  At some point, about a year ago I decided to use some Herbie's Giant Cone Decoupling Gliders under the acorns on the floor, hardwood. They make the equipment much easier to move as well as preserve the floor. A definite clearing up of the musical resolution. 
Roxy54, I have yet to completely understand if the Sistrum stands couple or decouple, but like you they are in my system to stay.
In What's Best Forum, garylkoh has an extensive paper on the coupling/decoupling subject, quite extensive and informative .I read the whole thread and the splitting hairs and opinions abound throughout. 
And Eric, yes the decoupling does leave the situation of back and fro movement or rather the stability of the speaker in doubt, according to Mr Koh.
Bottom line, if it sounds better go with it. I mean, it's a hobby so fiddle away, right?
Herbie's are good products. I use Iso cups and balls for my amps, Baby booties under the Step-up and Tender feet under the Computer Audio Design transport (CAT).
I also use Shun Mook Ultra Diamond (bought used) under the preamp and it's another story, another way to couple with music.
But responding to the initial question I believev in decoupling the speakers.