I have frequent audio problems with some of the high definition channels on my new Scientific Atlanta HD digital cable box here in Oceanside. This was extremely apparent during the Superbowl on channel 710, but consistently occurs during most any HD broadcast. In the case of channel 710 (ABC-HD), my Denon receiver recognizes that the audio is coming through the digital coaxial channel, but frequently drops out altogether and culminated with the picture dropping out as well during the Superbowl. I also have standard analog audio cables connected, and when I forced my receiver to use the analog signal, the audio drop out discontinued, but the volume dropped drastically. Problems on 708 (CBS-HD) and 707 (NBC-HD) are more related to synchronization. Dialogue and picture are consistently off. I have tried power cycling the cable box with some temporary improvement, but more often than not I get frustrated and simply watch the standard programming. We have waited a very long time and are paying an additional premium for the high definition service. The performance thus far has been very poor with the worst offenses during one of the highest watched broadcasts of the year…the Superbowl.