I have a Sony STR-DE885 a/v receiver with left, right, and center channel speakers.

I'd like to add three more speakers to get surround sound but don't relish the idea of running cables into the attic and down the walls or under the carpets or around doorways.

The audio outputs on the back of the unit are for regular two-wire speakers.

Is there some way I can hookup the speakers without wires?

Seems to me this would be a big seller if there were such a thing.