Barhoram,
I use a Xantech system with a stereo jack mini plug from the connecting block to the back of my 7200. I haven't tried an emitter but the plug works great. Make sure you are plugging it into the right connector. One is a remote IR in and the one beside it is IR out. There is also a 'multi' in for a second zone. You should use the remote in connection using a mono 3.5mm plug (I used a stereo one and it works fine also).
I use a Xantech system with a stereo jack mini plug from the connecting block to the back of my 7200. I haven't tried an emitter but the plug works great. Make sure you are plugging it into the right connector. One is a remote IR in and the one beside it is IR out. There is also a 'multi' in for a second zone. You should use the remote in connection using a mono 3.5mm plug (I used a stereo one and it works fine also).