Is this a Motorola box? What year is the box? If it's one of the older boxes, DVI output can be activated on the box. The cable company can guide you through it on the phone. DVI does not send audio, just video, so you will need to run a set of audio cables to the TV or stereo along with it. For image quality on cable/satellite, there is no difference with DVI or HDMI. Same signal. Different connector.