As we said yesterday, you NEED a receiver with preamp outputs to feed your powered speakers.
Since that seems to be your major concern, when looking at the websites describing them, go to the page describing their inputs and outputs (specs or features pages) and verify they have this feature.
It's really not that difficult.
Don't worry. Those PA speakers, not your receiver, will supply the "thump" you so crave, just as long as you're not expecting deep, extended bass. that's the job of a subwoofer.