I have a thick granite slab under my speakers, and it made a good difference, because the speakers were more stable. I also use Herbie audio's Extra Thick Hush Puckies between the spikes and the granite.
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I had to deal to deal with the same issue. My Tidals don't have spikes but the footers need to couple to something solid. I ended up being very happy with squares of granite (see photos in my system description.) The bass tightened up very nicely compared to lighter weight limestone tiles I'd used before that. The polished surface of the granite is a flatter plane than the surface of most concrete floors, no problem with uneven contact. As to worries about not being coupled to the floor compromising sound, one just has to try it and see I suppose. I don't see how the coupled mass of heavy speaker and stone slab is going to be making any movement of sufficient amplitude to diminish performance though. The experiment isn't particularly expensive, a stone supplier/kitchen remodeller only charged me $100 for two good sized slabs with polished edges. After replacing the carpet in our home with a floating strand bamboo floor, the speakers sound just as good on the floating floor as they did on stone slabs. We did put down a high quality acoustic foam sound transmission attenuating underlayment.
I have my Tonians on a 1 1/2" maple butcher block with metal discs under the spikes. I used to have some flagstone under the butcher blocks and tried many variations with these three elements and ended up without the flagstone, then without the discs, and then with just two per speaker and then under all the spikes, all along with experimenting with speaker cabling.
It took awhile to get what I wanted which made me very aware that even the slightest change alters the sound in a significant way.
Heed all advice but in the end, trust your ears.
All the best,
Thanks for your response. ZD, that's actually not the case. The spikes are very slim and adjustable. I've got them set up that the total of the brass footers (about 1") and the spikes is 2 1/8 inches long. I like Photon's idea as a starting point: simple, cheap, and non-invasive to carpet and floors. I may start by trying that. I am concerned that with the stone not coupled to the floor that it might induce resonances, but I suppose if I get a heavy enough piece of stone...
Great responses, thanks. Anyone else?
"I use standard spikes on carpet, Measure very carefully for perfect placement. Once I get placement just right, I stand on the base of my stand and push the spikes through the carpet."
I don't know if this is the OP's exact problem, but in my case, when I had speakers that were spiked, they didn't couple with the concrete floor underneath the carpet with the greatest solidity because the floor wasn't perfectly level. In homes with a poured slab, builders know most floors will end up with carpet and only take the time to float the concrete surface well in the areas that are going to get tile (kitchen and bath areas.) The living areas get a less well finished and level surface in many cases. I would have to move the speakers around in small increments to get an area where the speaker spikes all coupled securely. Having to move the speaker around like that isn't the optimal way to do it of course.
The other thing I did, just last night, was to adjust the way I had the spikes set up. I guess since I bought them last year, I had the rear spikes significantly lower than the front ones to angle drivers back. This had been a sonic benefit with every other pair of speakers I've owned, especially the ones I had just prior to these, Spendor S8es. By accident, I was kneeling on my own listening chair with my head elevated above where it would be listening, and I noticed that the soundstage was much more coherent, forward, and three dimensional. Just to see what would happen I tipped the speakers onto their sides and adjusted the spike - front and back - to a uniform 2 1/8". Back in my chair with the adjusted spikes the soundstage coherence I'd heard while kneeling was still there and on the whole much improved. We'll call that a good thing found completely by accident. Still have to work on that bass though.