Both feet and spikes will transfer energy to the horns. Try keeping all the bolts loose. This will tranfer less energy. You may get slightly better bass with the spikes
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The spikes (if they're any good) will transfer the resonance energy into the flooring system which is a very good thing. The plastic feet, on the other hand, are of no use.
Ensure all bolts taught or tighter, otherwise the vibrations will become trapped as a result of inferior or loose mechanical connections and since those vibrations (captured in a moment in time) would have nowhere to go, they can only dissipate over an extended period of time and exponentiate because of the poor connections. Sonically, this is not a good thing.