What is a good base for speakers

On a concrete carpeted basement, springs (like Nobsound) would work better than spike, rubber (or silicone) cone/feet, granite, concrete slab, ...?
Nobsound springs (4 of them) support up to 40lbs, but I guess it is pretty limited. Most full range speakers will weigh more than 40 lbs.
I’ve never tried springs. I thought spikes work best. I might try springs on my subwoofer. It rattles too much on high volume.

[EDIT] I see that it supports up to 66 lbs (or 30 kgs). The would cover most mid size speakers. 

Nonoise - those stands from DeerCreek are almost exactly what I purchased with my ADS L710’s over 40 years ago! Prices have really got crazy for simple steel stands. Still debating my approach to some stability for the 710’s.

Bryhifi - do you worry about warping with the bamboo cutting boards?

This video will give you an idea of why Deer Creek Audio Steel Stands cost a bit more:  https://www.youtube.com/watch?v=YkafYmxhmTY

+1 for Millercarbon, he is correct about springs.  I tried stone, spikes, no spikes, Herbbie's gliders and the Townshend podiums sound the best.  Get the cheap spring option he mentions and try them out

Symposium Svelteshelf, add some rollerblocks and you are home free