if I was the one spending the money on a power amp I would look for a crown K2. they are out of production, BUT they are a low draw high output amp that runs kool without fans.they also hardly ever break. I actually fully intend to eventualy get one, but do not nead one for the karaoke I am doing now. I have done sound for bands at LARGE outdoor festivals (5000 people) with 2 of these amps. we did have 6 very efficient EV subs and 4 EV tops. speakers that are efficient are cheaper that amps that make 10000 watts and dont blow circuit breakers.Mackie does have a couple amps in the 1000 watt range that won't brake ya.
the best option for large venues would be to get a couple of single 18 subs. JBL sells a couple different models that are powered and sound good. so you wouldn't need an extra amp. the price is in the ballpark of what a really good amp will cost, but setup is much less work than with more speakers more amps more cables ect there are less expensive brands out there, but you get what you pay for. it would be getting more technical again but you could then use an active crossover to take the ultra low bass out of your tops alowing you to get more volume out of them with only 500 watts.
Being that IM firmiliar with your area im willing to bet you do not have any discount music retailers around you but if you want you can im me and I can give you the 411 on the guy i deal with near milwaukee. he can and will make deals that are worth your drive whatever option you choose. he has blown away prices that I thought were good on ebay.
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