Did you get it from a retail store or a private party?
In either situation you should be all set if it was insured. Basically it is the shippers responsibility for what was shipped, FedEx will cover the damages and he should ship you a new amp at no cost to you and FedEx will pick up the damaged one, provided it was a retail store.
In my job I have to deal with receiving damaged shipments from both FedEx and UPS. FedEx defiantly seems to be a lot easier to deal with.
As far as me as the shipper, I have only had to deal with one damaged item through UPS. I sent my customer a new one at no cost and had to battle it out with UPS. UPS likes to use the phrase "improper packing"

So I told them If I knew they where going to kick it from Rhode Island to California I would have put it in a steel box. Long story short, I got my money back.
