My HDTV is about 4 years old and does not have a Digital Audio In port. For audio, it only has component and RCA input. I am seriously considering purchasing an Apple TV and am wondering if someone can tell me the best (and least expensive) way to get the audio from an ATV to my TV. Also, will the sound quality be severely diminished? I don't know much (read: anything) about digital audio output. Thanks in advance.