You will need a footer that will pierce the carpet and couple the speakers to the concrete floor. I like Stillpoints, but if you need additional height, Eden Sound and Mapleshade make robust and tall brass spikes.
So......what do you use under your speakers?
Looking to replace the stock spikes on my new speakers (Vivid Audio) that will make improvements in sound as well as give me a little more height. I have a commercial grade carpet over concrete with no padding. Not really looking to alter any frequency range but wouldn't mind general overall improvements in clarity, imaging, etc. I have been looking at Eden Sound Terracones, Stillpoints and Wave Kinetics. Price is not a deal breaker. TIA.