Neither. I have been a committed solid state guy since 1970. I use Quad amps pretty much exclusively.
My nine Quad power amps in the AV equipment chase.
I made that comment, because I feel we field an excessive number of posts related to Parasound amps, considering their market penetration. So I'm reluctant to recommend them. My advice is to return that amp and go for a full refund and get something else. Even if we accept this might be shipping related, any decently made power amp, should look as if it was hit by a sledge hammer to do what you witnessed. If there is no physical damage to the unit or packaging what happened to you is totally unacceptable. That was a dangerous event and not something that should have happened unless there was such obvious damage you would not accept the unit.
For an incident like that to happen, either the unit was not properly tested, or if there is causation from shipping without obvious damage to the unit or packaging then the unit is of flimsy construction. Either way this is not good. If it were me I would make a complaint to the consumer product safety division.