[photon]

There's wires, I'd be shocked if the developer installed them without wires. The question is where did they put them.

In my house all the ceiling speaker wires end up in the basement by the furnace in a wiring closet type of thing. When I built my house, and later when I put in my basement, I made sure to run speaker wires from the wiring closet back up to locations I would typically have a receiver, but that was an extra cost and a specific decision.

Since your basement is already finished, and if wires aren't run back to where your receiver would be, you'd have to either get new wires run, or come up with some kind of wireless or network type solution.

EDIT: I've also seen it where the wires are left in the wall in a specific place if the speakers are specifically for surround, so where you'd set up your receiver there might be wires behind the drywall, if they did that hopefully they documented that somewhere on the plans or other build documents.