all i will say is that the speakers play loud enough, and sounded great... but then the amp fried. as far as i'm concerned thats a limitation of the amp not the speakers.
the speakers will also put out a fair bit more mid volume than the max i played but the excursion limits start causing distortion on SOME songs, where the bass drops lower, for example some dubstep cannot be played as loud as some house music to generalize. This is not a major concern however, the main thing is to get an amp which will not overheat, the crossover thing would just be a nice tough thats all.
even my 40wpc tangent amp can control the cones to max excursion on songs like bass l love you (but overheats even worse than the arcam).
Hi OP - It looks like the weakest link is bound to get fried due to your specific demand. If the amp can hold it then may be the cross overs in speaker or some thing else may get damaged or such a possibility might exit. Consider the other possibility (PA system) if that is the prime requirement or djing for 300 people happens once in a while then hope nothing bad happens next time!