Ok so when we tested it back at the office when I would flip on the breakers that had the pars hooked up the voltage would jump 2 10ths at the most. I was at the theatre this morning and when untested it there it jumped 3 maybe 4 10ths. So what do I do know? I'm kinda at a loss. I'm thinking ok maybe I did have a bad amp out of the box for the second one but.... It just seems weird. If it was a craptastic amp vs a voltage problem can the repair shop tell that? What do I do know? We are running off a generator this week. Don't really want to do that forever.
So it sounds like your neutrals are stable, which is to be expected with a modern installation. I don't think that any repair shop is going to be able to determine the cause of the amp failure beyond a WAG, so there's more to think about. Let's boil this down to the basics.
There's really three principal failure mechanisms as I see it.
#1) There's some voltage spike incident that's trashing the power amps.
#2) The amplifiers have a design or build flaw.
#3) You're loading the outputs of the amplifier with too low impedance.
You can rule out #1 by actual testing or historical review. Historically, if other pieces of gear on this power feed have experienced recent failures, then that's the smoking gun. However, perhaps the other gear is more tolerant of voltage spikes (but I doubt it). See if you can rent a power quality monitor for a week or so. Fluke makes some nice ones that will report all voltage over and under conditions as well as log any spike incidents. Something like http://www.fluke.com/Fluke/r0en/Electrical-Test-Tools/Power-Quality-Tools/Fluke-43B-Series.htm?PID=56081
should do the trick.
You can rule out #2 by contacting the amplifier manufacturer or their user forum. Some amplifiers can be a bit sensitive to silly things. For instance, IIRC there was a pro amp design 20 years ago (Carver?) that wouldn't tolerate speakers being connected while the amp was powered up and passing signal. That would trash the output transistors a high percentage of the time.
You can rule out #3 by double checking all speaker connections and confirming you're not driving too low of a load. And sometimes the load isn't obvious. I was at a church in Texas a few years back that had a rack full of Crown amps, some of which had blown output channels. Everything appeared to be wired properly and none of the amps was driving under 4 ohms. However, I found one NL4 cable that was improperly wired and shorting between the 1+ and 2+ terminals on one end. This was a bi-amped monitor system so this short in the cable produced a direct connection between the high and low freq outputs of the amplifier. Now how did this problem travel across multiple amps in the rack? Well this cable was used to connect floor monitor speakers every Sunday, so it was wrapped after every gig and hung on the wall during the week. The following Sunday it would be used to connect another floor monitor randomly, thus it eventually found it's way on a bunch of different amplifiers and it would burn out an amp output with any sustained music.
Most apparently random events are not truly random if you can locate what's really changing.