Thats what I use under my 100+ lb speakers over a well built suspended hard wood floor and they work quite well. FWIW I don't buy into the theory regarding vibration draining as it might apply to speakers and I find that with heavy speakers they are as well coupled (yet isolated) with hockey pucks as any other materiel. I don't like soft rubber as you might get speaker movement from airborne vibrations from the speakers' bass drivers, and I subjectively feel that coupling with cones can facilitate the passing of vibrations from the floor into the speaker causing movement of the box, or perhaps even increasing an extant resonance in the speaker box itself. JMHO.
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