Nardoni,

Yes, you are right that there is not enough power from the PSR2000 to plug your 2000 into the speakers alone.

You need to plug your 2000 into the house mixing board console, which in turn goes into their house PA (amp) system and then to their speakers, OR if the house system consists of only self powered PA speakers, then you can plug your 2000 directly to them.

Hope this helps,

Scott