Originally Posted by Andy419
So basically I'm just looking for some concrete proof that underpowering can blow speakers .
You won't find any. While it is true, that pro audio companies use bigger amps (50%-TO 100% more) then the speakers are requiring, it is for headroom. Speakers blow. Period. Nothing anyone can do about it. They wear out, or just plain old blow up. I have never been able yet to blow a 600 watt driver using a 50 watt amp. Just sounds like arse.
The only way a smaller power amp will blow a speaker up is if it malfunctions in some way, from perhaps being driven too hard. Cliping (in pro sound) is always bad. If you have 2 speaker cabs rated at 300 watts each, you should be able to power them up with an amp that will deliver 200-600 watts at the rated ohms into that speaker and you should not have any problems. Having said that, your speakers will get old, wear out, or blow up, eventully. Again, nothing you can do about it. It may take along time.