You do, but you can minimize the risk by making sure that the amp CANNOT shift in the inner box (2-3 layers of large bubble wrap is good) and then placed in a 2nd box with peanuts tight between 2 boxes. For a heavy, dense item like an amp, peanuts are useless in the first box, the item will shift around and work its way to the outside. Also, re-inforce the box vertically, by placing a right angle folded piece of corrugated in each corner, that extends snuggly, from top to bottom.
