God bless Newbee for being a voice of reason. His advice regarding spikes and concrete floors is very good.
I will also suggest as an alternative...and an experiment...Aurios Pros isolation bearings. There are several Audiogon members who use Aurios under their loudspeakers and swear by the results.
Spikes utilize the coupling theory, while Aurios bearings utilize decoupling theory. In my experience, both techniques can be effective. It might be fun and educational to try both.
I will also suggest as an alternative...and an experiment...Aurios Pros isolation bearings. There are several Audiogon members who use Aurios under their loudspeakers and swear by the results.
Spikes utilize the coupling theory, while Aurios bearings utilize decoupling theory. In my experience, both techniques can be effective. It might be fun and educational to try both.

