Qwik & Dirty response:
The WK1630 (according to the specs)only has 2 x 5 watt output.Immediately, flags are going up saying "This poor guy's gonna get lost in the mix".
You need to be able to project that sound out to the audience. I really can't see this unit doing that without some primary amplification, or being run through the front end mix.
Just my thots...Good Luck in your choice.

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...L