Speaker Bass

I had exactly the same situation as you describe and tried various spikes, V-pads, platforms, etc.

What I finally settled on were Herbies decoupling disks which fit between your spikes and the carpet to efffectively isolate the speaker from the floor and give significantly improved dynamics. It worked for me.

I use Isoblocks (laminated cork and rubber) which do a decent job of decoupling without sucking much life out of the sound. The bass is pretty tight, but has a certain warmth to it that I enjoy.

My listeninwg area has carpet over poured cement. I've put my speakers on wood on Travertine tile. This should be something you can try with purchases (mainly) from the local hardware store. If the WAF is not there, you won't have spent a fortune. For my system, "rubbery" options didn't sound good. Seemed to lose focus. FWIW, my system is posted. Good luck.