I have connected the MC200 to the G91A using a speakerlink to din cable , as supplied by Audio-images. (My G91A feeds a DSP5000 center and DSP5500 mains). The audio connection is via a digital coax.
An analogue audio/video feed to the TV input from a satellite decoder is the only other connection to the G91.

MC200, G91A, DSP5500, DSP5000C ,DSP 3200