Hi Bill Your right, It is gonna be a heavy one for shure, but the sand will be usefull to prevent cabinet resonating(if there will be some?)and doubling the back/side walls i think would be better than not doing so(no "swinging" panels when the amplifier are firing at all 8 sylinders!). The weight don´t worry me because im not gonna ship´m with "Fedex" and the volume makes it hard to lift alone even with sand or not."It´s better to carry a gun and not have to use it than not carry one and really need it" Kane