I'm not sure of any ways to send it through your Mac, but you could get a simple phono cable (correct word?) and plug it into the headphone jack on the iPad and run it to your audio in on your stereo. Although you may need to run the audio in through a cable that has the red-white connectors for your stereo...
Man, can someone help w/ the proper names of these cables? Way too lazy to look them up right now. 🙁
(But a phono is what I use when plugging my iPad into my speakers)
Ian