A powered speaker setup is not likely to meet your needs if you have drums, bass, guitars, etc unless you are willing to spend a lot of cash.
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Agreed. Two other problems.
Speakers and amps are 2 different animals. With a powered speaker setup, if one part blows up, you loose the use of the other. With discreet components, it's much easier (and cheaper) to substitute components in an emergency.
Also, an unpowered speaker is a LOT lighter, and easier to maneuver.
Paul