I have my amp on a sand filled box 12" off the floor. I found that lower than 12" my amp was always filled with dust from the carpet. As far as the sand filled box, it made no difference in isolating shock from the floor and I still had to put rubber squares under the stand for isolating floor vibrations. I think the weight of the amp settled the sand and it compacted to a firm base. I have had very good results with a sand filled base on my transport.
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