I have a pair of b&w DM604s that will be placed on a carpeted floor. The guy who sold them to me didn't have the floor spikes. 1. Do the speakers really *need* to be anchored to the carpet with spikes? 2. Will there be any vibration if the spikes are missing? 3. Does anyone on this board have a set of 8 spikes for the 604s they wish to sell?