Hi! I'm wondering whether filling my mission Stancette stands with sand will improve bass quality and depth to my Paradigm studio 20's? If so what particular sand shoud i be looking for? i have heard that hifi dealers do have a kind of sand but I'm totally dud about it!!! Also the spikes on my stands are metal, should i be getting rubber spikes or shoes for them? I mean is this going to improve the quality, otherwise its not worth the trouble! Thanks!