Speakers on carpet over concrete

Thank you all for some excellent options.  I didn't think the bass would vibrate the house due to the mass of the floor.  I'll start with the cheaper options like hockey pucks.

You do not want a speaker stand or a speaker resting on carpet and rocking about. You want to be sure that the speaker/stand Is in solid contact with the hard surface of the floor. My stands spikes make solid contact with the concrete beneath the carpet/pad. The stands are filled with Atacama Atabites...my stands do not budge, nor do speakers. Blutac is used between speaker and stand. 

I agree about not using spikes on a wood or composite floor, however if you have a pored concrete floor with carpet & pad overlay and properly spiked speakers, the floor is not going to absorb the bass. By using long enough spikes so the tips rest on the slab and the speaker cabinet bottoms are raised high enough to clear the carpet surface. You will have a solid, stable connection to the floor. Make sure you have sharp spikes and they are long enough.

@jc4659 - I have exactly the same setup in my basement (carpet on concrete), so I took a slightly different approach to others, which appears (to me) to work very well

Under each speaker

• I use two 18" square granite tiles on top of each other with a layer of thin foam drawer liner between them
  • this acts as an isolating sandwich
• at each corner of the lower tile I glue one of these
  • spiked plastic carpet protectors
• The speaker sits on top ot the two tiles using its spiked feet
• This larger "base" is just like installing outriggers to the speakers, which minimizes any movement
• after about two months the underlay is compressed under each spiked foot resulting in a very firm platform on which to place the speaker

My speaker weighs about 60 lbs, which contributes even more to their stability

So now my speakrs are

• nicley seperated/isolated from the concrete under the carpet
• very stable (actually rock solid)
• sounding amazingly detailed with a large and spacious image

One other approach to achieve additional speaker stability is to add heavy weight on top of the speaker - this prevents the woofer cone from moving the speaker cabinet

• A friend places a 15lb bar-bell on top of each speaker
• doesn't look elegant - but it works ! 🤪

Hope that helps - Steve

I was reading the other day that Richard Vandersteen, specifically uses spikes to enhance the sound from his speakers. He only wants drivers moving, not the enclosure. He wants the speaker to couple to the concrete because it moves less than any other surface in our homes.