Using platforms / shelves under floorstanders?

It depends what your floor is made of. If it's concrete then maple platforms might bring some improvement to the sound. I have the Mapleshade platforms, on concrete floor, and they do very well. But using them without spikes wouldn't make so much sense, I imagine, because you'd lose the coupling to the floor.
One way to prevent damaging woodfloors because of spikes is to place Yamamoto PB-10 footers under the spikes. They're imported by Venus Hi-Fi, and you'll find a review of them on 6-moon.

Check out Promethean springs at Machina Dynamica website

In my trials, I've found, that maple under the speakers pretty much kills the sound. Sistrum SP-101 is so much better. With time, I'm going to get rid of the maple in my system alltogether.

I used a sandstone slab + nordost pulsar points, but find a Symposium Svelt shelves + Rollerblock juniors, a significant improvement on a suspended wooden floor.

Hi,

I have thick carpet and I use the spikes but the speakers don't stand solid because the spikes seem not to punch through the carpet. What do you suggest for speakers with thick carpet?
Thanks!
Tran