Yes, you can connect a cable box (or any device with an HDMI output) via HDMI-to-DVI and a separate digital cable and still use the lip sync adjustment. On the 990, any video source allows lip sync adjustment (including the multichannel analog). On the 970, the only limitation you might run into is the multichannel analog input when in full bypass mode or HPF/LPF analog bass management mode (there's a three-position switch on the back that determines how the 970 handles its multichannel analog input).