Apple TV/FM Radio System - Manual (Page 46)

Connecting video equipment if you use an
S-video connector
To connect your video equipment you need one video cable
with S-video connectors on both ends and two audio cables
with RCA plugs at both ends. The RCA cables can be separate
or joined. You can purchase cables at electronics supply
stores.
Note: If you have only one audio out port on your video
equipment, you can use a Y-adapter audio cable. This cable
has a single plug on one end to plug into your equipment
and a double plug (where it forms a Y) on the other end to
plug into the two audio ports on the video input card.
RCA RCA
RCA RCA
S-video S-video
RCA
audio
audio
2 audio
RCA
S-video S-video
or
39 Installing the Card and Software