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At my old house, I had a pair of wired speakers outside, above our patio. It was a setup that pre-dated AirPlay by many years, so it was originally driven by a good, old-fashioned stereo receiver.
Eventually, I disconnected the speakers from the receiver and rewired them to a Griffin 20 amp that connected to an AirPort Express, enabling AirPlay. It was a hacky solution, but it worked perfectly.