2x10's will NOT fill an auditorium.
They won't even fill a smallish club with a moderately loud drumber unless you have the baddest 2x10 in the world.
I just got thru doing a buncha nights up in St. Augustine and since it was a low paying gig I used my SWR and a GK 2x10 cab I use sometimes for softer gigs. Simply didn't cut it at ALL!
I knew it wouldn't ....... I've used it for smaller gigs for quite a while and always had a problem if it got beyong soft levels but I didn't want to haul my largish SVT410HLF cab (which sounds wonderful) so I tried it for a few weeks. Just didn't cut it and eventually, as I pushed it harder and harder trying to get enough output the speakers suddenly just quit!
Opened the voice coils! 
Let that be a lesson to me.

I'll replace them with drivers that'll handle high wattage so I don't eat the drivers again but that small of a cab and that small of speaker square inches will only do so much.
If you want something that'll handle any gig you want 4x10 or a 15 and a couple of 10s or a couple 15s.
If you know the secret codes you can get by the mastering boss on level 8.
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