I will be constructing some speaker stands; they will be 24-30" tall. Not sure yet on the height. They will be the PVC pipe type. I know that filling them with sand or steel shot is a very good thing. My concern is that with all the added weight being on a vertical plane, the stand will be "tippy." Much different than say, if you bolted a plate of thick steel to the base of the stand to weight the bottom...make sense? I'm not a physics major (I believe that's obvious ) but it seems to make sense to me. Also, I've noticed that better premade stands come with carpet spikes. Do you NEED carpet spikes? Has anyone made their own stands with spikes? What did you use for the spikes? Nails? Are the spikes meant to secure the stand to carpet, or to keep the stand from sitting directly on the floor if you have wooden floors. Someone explain this spike thing, please. Thanks.