mag 254 4 pin composite output

If you have the cable, just plug it in your stereo and see what happens. If that doesnt work, run a stereo out from your TV to your stereo and turn off the volume on the TV. I know some of the TVs can only do stereo out under volume control, do it that way and see how it sounds.

If your stereo doesn't have HDMI then see about buying an HDMI to component and run the video to the TV and the audio to your stereo. You should be able to pickup cheap component cables at a thrift store and the same for the HDMI to component on eBay.