I have a Velodyne CHT 12 sub and we just moved to a new house. The room the sub is in is the family in which the whole room is tiled with 18x18 inch tile. The sub is in the little cove where the tv is suppose to go but the cove is too small for my current tv. Should I use the rubber feet that came with the sub, the kind that you stick on the bottom of the sub, since it is sitting on tile? How will the sound of the sub change if I put the rubber feet on it?