As stated earlier in the thread, good packing is the key. With am amp you should be able to throughly pack it in a paper box and then put a wooden crate around that. That's the safest way besides shipping via air. Packages that travel on the ground are loaded and unloaded much much more than an air package which is part of the reason that ground packages are more likely to be damages. Traveling over-road for hundreds of miles also increases the likely-hood of damage.
