"DAB boasts a much superior sound quality than that of the conventional services. It also does not suffer like analogue services from noise sources such as power lines or other radio stations (adjacent channel interference). This means that the quality of transmission can be chosen between near CD quality stereo (256 kbps) right down to low bitrate mono transmission (less than 100 kbps)."
What is DAB, and how does it work? Read on over here.