Are you really recommending buying a receiver just to use as an adaptor for your existing audio gear?
It's great if you've already got one but I think he was suggesting a small and inexpensive plug in adaptor.
No, I'm not suggesting anything, just looking for clarification on what the OP was saying and using my receiver as an example of a two-way AirPlay conduit. That said, if you have other a/v components, you need a receiver anyway. Might as well get one with AirPlay so you can extend audio to remote locations in the house. I stream all over the house and use the Remote app to select what's playing. It's great. Also, basic 5.1 A/V receivers are really inexpensive these days. It's more a matter of space than $.