Right now I have connected the xm radio audio input (the video is connected to the RSE video in) although I don't subscribe to xm. If decide to connect a PS3 in the rear for the kids, I will have to switch the audio inputs to the RSE audio in. Right now they get plenty of PS3 at home so in essence I really don't use that input. I suppose one could get a cheap passive audio switch and put it behind and below the HU where there is some room. If I could add anything it would probably be a HD radio tuner but it does not use that input anyway and the Pioneer add-on HD tuner does not have a good reputation from what I read and it costs about twice what I think it should cost.
Anyway, the answer is that I don't use that input other than the initial 30 days of free xm service I got last November. If you are serious about xm and want a good interface, I would get the Pioneer add-on unit since it integrates well with the 110/120/130.
Lol, going through this thought train, I guess I should hook up the RSE audio
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