Speaker placement directly on floor?


Just purchased a used pair of PSB Stratus GOLD i speakers.
They will be in my basement. My basement floor is a concrete
base with 1 foot by 1 foot tile squares on top. The floor is
pretty level. Should the speakers be placed directly on the floor or they have threaded holes in the bottom and the
seller of speakers gave me little 1/2 inch threaded rubber
feet to insert on bottom of speakers. What is recommended, or could something be purchased to insert into those threaded holes that would work better?
ekaras
Forgot to mention that Polycrystal (and Audiopoints) can
come with 1/4 - 20 threads that screw directly into base
of PSB Gold-i. Audiopoints are brass, manf recommends slim
version for Golds. Polycrystal are also brass, but coated with polycrystal material.....for full effect go with the
collossial 2" spikes.
The seller also included some threaded spikes with the speakers, but I thought that those were used on rugs.
My floor is hard ceramic tile squares.
The threaded spikes are an inexpensive way to control acoustical, mechanical and electronic generated resonance. Some times other products such as Audio Points look and/or work better, thats a personal decision. You can also purchase the Audio Point Coupling Disc (APCD2) if you are concern about the small indentation made by the spike or Audio Point.
I think it would be a good/cheap idea to get a set of coupling discs to put between the spikes and your floor. They only cost about $6 each, would protect your floor and are (theoretically) better than using the rubber feet.