Bubble wrap won't help much, the thing about Dynamat is that it adds weight to the surface applied to, thus making it harder to rattle. Not to mention it does have some sound absorbing qualities...As far as moving your sub around, it doesn't make much of a difference, bass is an omni-directional sound as in it is not focused. Mids and highs are directional and that's why you have to worry about imaging and stuff with them. Bass just kinda eminates in all directions..........