In my case using Stillpoint Ultra SS on my Focal 1028be speakers on ultra thick carpet with rubber padding underneath, the spikes improved the stability and sound.
Although I had the spikes, they were not long or sharp enough to penetrate the carpet backing and the pad beneath. What they did do was prevent the speakers from rocking on the carpet. The downside was moving the speakers became a huge hassle.
Since then, I've purchased Sopra n2 Speakers and haven't figured a way to adapt the UltraSS to the glass base of the Sopra's.
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